diff --git a/libphobos/libdruntime/MERGE b/libphobos/libdruntime/MERGE
index e3763485adf..c6357317ddc 100644
--- a/libphobos/libdruntime/MERGE
+++ b/libphobos/libdruntime/MERGE
@@ -1,4 +1,4 @@
-2b5c0b2766949e788e4929c5fb0e2ba698ff79a3
+476882795473a884f837bea6da850ac5181868d1
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/druntime repository.
diff --git a/libphobos/libdruntime/Makefile.am b/libphobos/libdruntime/Makefile.am
index e1a38153de0..e1f47d36f90 100644
--- a/libphobos/libdruntime/Makefile.am
+++ b/libphobos/libdruntime/Makefile.am
@@ -255,12 +255,12 @@ DRUNTIME_DSOURCES_LINUX = core/sys/linux/config.d \
 	core/sys/linux/sched.d core/sys/linux/stdio.d core/sys/linux/string.d \
 	core/sys/linux/sys/auxv.d core/sys/linux/sys/eventfd.d \
 	core/sys/linux/sys/file.d core/sys/linux/sys/inotify.d \
-	core/sys/linux/sys/mman.d core/sys/linux/sys/netinet/tcp.d \
-	core/sys/linux/sys/prctl.d core/sys/linux/sys/signalfd.d \
-	core/sys/linux/sys/socket.d core/sys/linux/sys/sysinfo.d \
-	core/sys/linux/sys/time.d core/sys/linux/sys/xattr.d \
-	core/sys/linux/termios.d core/sys/linux/time.d \
-	core/sys/linux/timerfd.d core/sys/linux/tipc.d core/sys/linux/unistd.d
+	core/sys/linux/sys/mman.d core/sys/linux/sys/prctl.d \
+	core/sys/linux/sys/signalfd.d core/sys/linux/sys/socket.d \
+	core/sys/linux/sys/sysinfo.d core/sys/linux/sys/time.d \
+	core/sys/linux/sys/xattr.d core/sys/linux/termios.d \
+	core/sys/linux/time.d core/sys/linux/timerfd.d core/sys/linux/tipc.d \
+	core/sys/linux/unistd.d
 
 DRUNTIME_DSOURCES_NETBSD = core/sys/netbsd/dlfcn.d \
 	core/sys/netbsd/execinfo.d core/sys/netbsd/string.d \
diff --git a/libphobos/libdruntime/Makefile.in b/libphobos/libdruntime/Makefile.in
index 4130e96d7be..53402842cb4 100644
--- a/libphobos/libdruntime/Makefile.in
+++ b/libphobos/libdruntime/Makefile.in
@@ -334,13 +334,12 @@ am__objects_17 = core/sys/linux/config.lo core/sys/linux/dlfcn.lo \
 	core/sys/linux/stdio.lo core/sys/linux/string.lo \
 	core/sys/linux/sys/auxv.lo core/sys/linux/sys/eventfd.lo \
 	core/sys/linux/sys/file.lo core/sys/linux/sys/inotify.lo \
-	core/sys/linux/sys/mman.lo core/sys/linux/sys/netinet/tcp.lo \
-	core/sys/linux/sys/prctl.lo core/sys/linux/sys/signalfd.lo \
-	core/sys/linux/sys/socket.lo core/sys/linux/sys/sysinfo.lo \
-	core/sys/linux/sys/time.lo core/sys/linux/sys/xattr.lo \
-	core/sys/linux/termios.lo core/sys/linux/time.lo \
-	core/sys/linux/timerfd.lo core/sys/linux/tipc.lo \
-	core/sys/linux/unistd.lo
+	core/sys/linux/sys/mman.lo core/sys/linux/sys/prctl.lo \
+	core/sys/linux/sys/signalfd.lo core/sys/linux/sys/socket.lo \
+	core/sys/linux/sys/sysinfo.lo core/sys/linux/sys/time.lo \
+	core/sys/linux/sys/xattr.lo core/sys/linux/termios.lo \
+	core/sys/linux/time.lo core/sys/linux/timerfd.lo \
+	core/sys/linux/tipc.lo core/sys/linux/unistd.lo
 @DRUNTIME_OS_LINUX_TRUE@am__objects_18 = $(am__objects_17)
 am__objects_19 = core/sys/windows/accctrl.lo \
 	core/sys/windows/aclapi.lo core/sys/windows/aclui.lo \
@@ -878,12 +877,12 @@ DRUNTIME_DSOURCES_LINUX = core/sys/linux/config.d \
 	core/sys/linux/sched.d core/sys/linux/stdio.d core/sys/linux/string.d \
 	core/sys/linux/sys/auxv.d core/sys/linux/sys/eventfd.d \
 	core/sys/linux/sys/file.d core/sys/linux/sys/inotify.d \
-	core/sys/linux/sys/mman.d core/sys/linux/sys/netinet/tcp.d \
-	core/sys/linux/sys/prctl.d core/sys/linux/sys/signalfd.d \
-	core/sys/linux/sys/socket.d core/sys/linux/sys/sysinfo.d \
-	core/sys/linux/sys/time.d core/sys/linux/sys/xattr.d \
-	core/sys/linux/termios.d core/sys/linux/time.d \
-	core/sys/linux/timerfd.d core/sys/linux/tipc.d core/sys/linux/unistd.d
+	core/sys/linux/sys/mman.d core/sys/linux/sys/prctl.d \
+	core/sys/linux/sys/signalfd.d core/sys/linux/sys/socket.d \
+	core/sys/linux/sys/sysinfo.d core/sys/linux/sys/time.d \
+	core/sys/linux/sys/xattr.d core/sys/linux/termios.d \
+	core/sys/linux/time.d core/sys/linux/timerfd.d core/sys/linux/tipc.d \
+	core/sys/linux/unistd.d
 
 DRUNTIME_DSOURCES_NETBSD = core/sys/netbsd/dlfcn.d \
 	core/sys/netbsd/execinfo.d core/sys/netbsd/string.d \
@@ -1526,11 +1525,6 @@ core/sys/linux/sys/eventfd.lo: core/sys/linux/sys/$(am__dirstamp)
 core/sys/linux/sys/file.lo: core/sys/linux/sys/$(am__dirstamp)
 core/sys/linux/sys/inotify.lo: core/sys/linux/sys/$(am__dirstamp)
 core/sys/linux/sys/mman.lo: core/sys/linux/sys/$(am__dirstamp)
-core/sys/linux/sys/netinet/$(am__dirstamp):
-	@$(MKDIR_P) core/sys/linux/sys/netinet
-	@: > core/sys/linux/sys/netinet/$(am__dirstamp)
-core/sys/linux/sys/netinet/tcp.lo:  \
-	core/sys/linux/sys/netinet/$(am__dirstamp)
 core/sys/linux/sys/prctl.lo: core/sys/linux/sys/$(am__dirstamp)
 core/sys/linux/sys/signalfd.lo: core/sys/linux/sys/$(am__dirstamp)
 core/sys/linux/sys/socket.lo: core/sys/linux/sys/$(am__dirstamp)
@@ -1867,8 +1861,6 @@ mostlyclean-compile:
 	-rm -f core/sys/linux/netinet/*.lo
 	-rm -f core/sys/linux/sys/*.$(OBJEXT)
 	-rm -f core/sys/linux/sys/*.lo
-	-rm -f core/sys/linux/sys/netinet/*.$(OBJEXT)
-	-rm -f core/sys/linux/sys/netinet/*.lo
 	-rm -f core/sys/netbsd/*.$(OBJEXT)
 	-rm -f core/sys/netbsd/*.lo
 	-rm -f core/sys/netbsd/sys/*.$(OBJEXT)
@@ -2027,7 +2019,6 @@ clean-libtool:
 	-rm -rf core/sys/linux/.libs core/sys/linux/_libs
 	-rm -rf core/sys/linux/netinet/.libs core/sys/linux/netinet/_libs
 	-rm -rf core/sys/linux/sys/.libs core/sys/linux/sys/_libs
-	-rm -rf core/sys/linux/sys/netinet/.libs core/sys/linux/sys/netinet/_libs
 	-rm -rf core/sys/netbsd/.libs core/sys/netbsd/_libs
 	-rm -rf core/sys/netbsd/sys/.libs core/sys/netbsd/sys/_libs
 	-rm -rf core/sys/openbsd/.libs core/sys/openbsd/_libs
@@ -2183,7 +2174,6 @@ distclean-generic:
 	-rm -f core/sys/linux/$(am__dirstamp)
 	-rm -f core/sys/linux/netinet/$(am__dirstamp)
 	-rm -f core/sys/linux/sys/$(am__dirstamp)
-	-rm -f core/sys/linux/sys/netinet/$(am__dirstamp)
 	-rm -f core/sys/netbsd/$(am__dirstamp)
 	-rm -f core/sys/netbsd/sys/$(am__dirstamp)
 	-rm -f core/sys/openbsd/$(am__dirstamp)
diff --git a/libphobos/libdruntime/core/math.d b/libphobos/libdruntime/core/math.d
index 878623258cd..219b4263ff2 100644
--- a/libphobos/libdruntime/core/math.d
+++ b/libphobos/libdruntime/core/math.d
@@ -167,9 +167,11 @@ unittest
 /*************************************
  * Round argument to a specific precision.
  *
- * D language types specify a minimum precision, not a maximum. The
- * `toPrec()` function forces rounding of the argument `f` to the
- * precision of the specified floating point type `T`.
+ * D language types specify only a minimum precision, not a maximum. The
+ * `toPrec()` function forces rounding of the argument `f` to the precision
+ * of the specified floating point type `T`.
+ * The rounding mode used is inevitably target-dependent, but will be done in
+ * a way to maximize accuracy. In most cases, the default is round-to-nearest.
  *
  * Params:
  *      T = precision type to round to
@@ -206,9 +208,10 @@ T toPrec(T:real)(real f)  { pragma(inline, false); return f; }
 
 @safe unittest
 {
-    static float f = 1.1f;
-    static double d = 1.1;
-    static real r = 1.1L;
+    // Test all instantiations work with all combinations of float.
+    float f = 1.1f;
+    double d = 1.1;
+    real r = 1.1L;
     f = toPrec!float(f + f);
     f = toPrec!float(d + d);
     f = toPrec!float(r + r);
@@ -219,19 +222,32 @@ T toPrec(T:real)(real f)  { pragma(inline, false); return f; }
     r = toPrec!real(d + d);
     r = toPrec!real(r + r);
 
-    /+ Uncomment these once compiler support has been added.
+    // Comparison tests.
+    bool approxEqual(T)(T lhs, T rhs)
+    {
+        return fabs((lhs - rhs) / rhs) <= 1e-2 || fabs(lhs - rhs) <= 1e-5;
+    }
+
     enum real PIR = 0xc.90fdaa22168c235p-2;
     enum double PID = 0x1.921fb54442d18p+1;
     enum float PIF = 0x1.921fb6p+1;
-
-    assert(toPrec!float(PIR) == PIF);
-    assert(toPrec!double(PIR) == PID);
-    assert(toPrec!real(PIR) == PIR);
-    assert(toPrec!float(PID) == PIF);
-    assert(toPrec!double(PID) == PID);
-    assert(toPrec!real(PID) == PID);
-    assert(toPrec!float(PIF) == PIF);
-    assert(toPrec!double(PIF) == PIF);
-    assert(toPrec!real(PIF) == PIF);
-    +/
+    static assert(approxEqual(toPrec!float(PIR), PIF));
+    static assert(approxEqual(toPrec!double(PIR), PID));
+    static assert(approxEqual(toPrec!real(PIR), PIR));
+    static assert(approxEqual(toPrec!float(PID), PIF));
+    static assert(approxEqual(toPrec!double(PID), PID));
+    static assert(approxEqual(toPrec!real(PID), PID));
+    static assert(approxEqual(toPrec!float(PIF), PIF));
+    static assert(approxEqual(toPrec!double(PIF), PIF));
+    static assert(approxEqual(toPrec!real(PIF), PIF));
+
+    assert(approxEqual(toPrec!float(PIR), PIF));
+    assert(approxEqual(toPrec!double(PIR), PID));
+    assert(approxEqual(toPrec!real(PIR), PIR));
+    assert(approxEqual(toPrec!float(PID), PIF));
+    assert(approxEqual(toPrec!double(PID), PID));
+    assert(approxEqual(toPrec!real(PID), PID));
+    assert(approxEqual(toPrec!float(PIF), PIF));
+    assert(approxEqual(toPrec!double(PIF), PIF));
+    assert(approxEqual(toPrec!real(PIF), PIF));
 }
diff --git a/libphobos/libdruntime/core/stdc/assert_.d b/libphobos/libdruntime/core/stdc/assert_.d
index 18af7132e38..fc9402f6051 100644
--- a/libphobos/libdruntime/core/stdc/assert_.d
+++ b/libphobos/libdruntime/core/stdc/assert_.d
@@ -17,6 +17,15 @@
 
 module core.stdc.assert_;
 
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
+
 extern (C):
 @trusted:
 nothrow:
@@ -39,10 +48,10 @@ else version (CRuntime_Microsoft)
     ///
     void _assert(const(char)* exp, const(char)* file, uint line);
 }
-else version (OSX)
+else version (Darwin)
 {
     /***
-     * Assert failure function in the OSX C library.
+     * Assert failure function in the Darwin C library.
      */
     void __assert_rtn(const(char)* func, const(char)* file, uint line, const(char)* exp);
 }
diff --git a/libphobos/libdruntime/core/stdc/errno.d b/libphobos/libdruntime/core/stdc/errno.d
index 80105d70de7..767ed242472 100644
--- a/libphobos/libdruntime/core/stdc/errno.d
+++ b/libphobos/libdruntime/core/stdc/errno.d
@@ -211,6 +211,50 @@ version (Windows)
     enum ENOTEMPTY          = 41;       /// Directory not empty
     enum EILSEQ             = 42;       /// Illegal byte sequence
     enum EDEADLOCK          = EDEADLK;  /// Resource deadlock would occur
+
+    // POSIX compatibility
+    // See_Also: https://docs.microsoft.com/en-us/cpp/c-runtime-library/errno-constants
+    enum EADDRINUSE         = 100;
+    enum EADDRNOTAVAIL      = 101;
+    enum EAFNOSUPPORT       = 102;
+    enum EALREADY           = 103;
+    enum EBADMSG            = 104;
+    enum ECANCELED          = 105;
+    enum ECONNABORTED       = 106;
+    enum ECONNREFUSED       = 107;
+    enum ECONNRESET         = 108;
+    enum EDESTADDRREQ       = 109;
+    enum EHOSTUNREACH       = 110;
+    enum EIDRM              = 111;
+    enum EINPROGRESS        = 112;
+    enum EISCONN            = 113;
+    enum ELOOP              = 114;
+    enum EMSGSIZE           = 115;
+    enum ENETDOWN           = 116;
+    enum ENETRESET          = 117;
+    enum ENETUNREACH        = 118;
+    enum ENOBUFS            = 119;
+    enum ENODATA            = 120;
+    enum ENOLINK            = 121;
+    enum ENOMSG             = 122;
+    enum ENOPROTOOPT        = 123;
+    enum ENOSR              = 124;
+    enum ENOSTR             = 125;
+    enum ENOTCONN           = 126;
+    enum ENOTRECOVERABLE    = 127;
+    enum ENOTSOCK           = 128;
+    enum ENOTSUP            = 129;
+    enum EOPNOTSUPP         = 130;
+    enum EOTHER             = 131;
+    enum EOVERFLOW          = 132;
+    enum EOWNERDEAD         = 133;
+    enum EPROTO             = 134;
+    enum EPROTONOSUPPORT    = 135;
+    enum EPROTOTYPE         = 136;
+    enum ETIME              = 137;
+    enum ETIMEDOUT          = 138;
+    enum ETXTBSY            = 139;
+    enum EWOULDBLOCK        = 140;
 }
 else version (linux)
 {
diff --git a/libphobos/libdruntime/core/stdc/stdint.d b/libphobos/libdruntime/core/stdc/stdint.d
index b04283174c1..0e310521e0e 100644
--- a/libphobos/libdruntime/core/stdc/stdint.d
+++ b/libphobos/libdruntime/core/stdc/stdint.d
@@ -19,6 +19,14 @@ private import core.stdc.stddef; // for wchar_t
 private import core.stdc.signal; // for sig_atomic_t
 private import core.stdc.wchar_; // for wint_t
 
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
 
 // Can't be `private` because of @@@BUG11173@@@.
 T _typify(T)(T val) @safe pure nothrow { return val; }
@@ -77,7 +85,7 @@ version (Windows)
     alias intmax_t  = long;      ///
     alias uintmax_t = ulong;     ///
 }
-else version (OSX)
+else version (Darwin)
 {
     alias int8_t   = byte;          ///
     alias int16_t  = short;         ///
@@ -140,6 +148,15 @@ else version (Posix)
         alias int_fast32_t  = int;  ///
         alias uint_fast32_t = uint; ///
     }
+    else version (CRuntime_Musl)
+    {
+        alias int_fast8_t   = byte;  ///
+        alias uint_fast8_t  = ubyte; ///
+        alias int_fast16_t  = int;   ///
+        alias uint_fast16_t = uint;  ///
+        alias int_fast32_t  = int;   ///
+        alias uint_fast32_t = uint;  ///
+    }
     else
     {
         alias int_fast8_t   = byte;      ///
diff --git a/libphobos/libdruntime/core/stdc/string.d b/libphobos/libdruntime/core/stdc/string.d
index b7660d8f8ea..0929a4eab53 100644
--- a/libphobos/libdruntime/core/stdc/string.d
+++ b/libphobos/libdruntime/core/stdc/string.d
@@ -23,6 +23,12 @@ else version (TVOS)
 else version (WatchOS)
     version = Darwin;
 
+// Those libs don't expose the mandated C interface
+version (CRuntime_Glibc)
+    version = ReturnStrerrorR;
+else version (CRuntime_UClibc)
+    version = ReturnStrerrorR;
+
 extern (C):
 @system:
 nothrow:
@@ -76,50 +82,17 @@ pure inout(char)*  strstr(return inout(char)* s1, scope const char* s2);
 char*  strtok(return char* s1, scope const char* s2);
 ///
 char*  strerror(int errnum);
-version (CRuntime_Glibc)
+// This `strerror_r` definition is not following the POSIX standard
+version (ReturnStrerrorR)
 {
     ///
     const(char)* strerror_r(int errnum, return char* buf, size_t buflen);
 }
-else version (Darwin)
-{
-    int strerror_r(int errnum, scope char* buf, size_t buflen);
-}
-else version (FreeBSD)
-{
-    int strerror_r(int errnum, scope char* buf, size_t buflen);
-}
-else version (NetBSD)
-{
-    int strerror_r(int errnum, char* buf, size_t buflen);
-}
-else version (OpenBSD)
-{
-    int strerror_r(int errnum, scope char* buf, size_t buflen);
-}
-else version (DragonFlyBSD)
+// This one is
+else
 {
     int strerror_r(int errnum, scope char* buf, size_t buflen);
 }
-else version (Solaris)
-{
-    int strerror_r(int errnum, scope char* buf, size_t buflen);
-}
-else version (CRuntime_Bionic)
-{
-    ///
-    int strerror_r(int errnum, scope char* buf, size_t buflen);
-}
-else version (CRuntime_Musl)
-{
-    ///
-    int strerror_r(int errnum, scope char *buf, size_t buflen);
-}
-else version (CRuntime_UClibc)
-{
-    ///
-    const(char)* strerror_r(int errnum, return char* buf, size_t buflen);
-}
 ///
 pure size_t strlen(scope const char* s);
 ///
diff --git a/libphobos/libdruntime/core/sys/darwin/mach/port.d b/libphobos/libdruntime/core/sys/darwin/mach/port.d
index b9551fa52e0..1c5cf6df2c0 100644
--- a/libphobos/libdruntime/core/sys/darwin/mach/port.d
+++ b/libphobos/libdruntime/core/sys/darwin/mach/port.d
@@ -25,12 +25,5 @@ else version (WatchOS)
 version (Darwin):
 extern (C):
 
-version (X86)
-    version = i386;
-version (X86_64)
-    version = i386;
-version (i386)
-{
-    alias uint        natural_t;
-    alias natural_t   mach_port_t;
-}
+alias natural_t = uint;
+alias mach_port_t = natural_t;
diff --git a/libphobos/libdruntime/core/sys/darwin/mach/thread_act.d b/libphobos/libdruntime/core/sys/darwin/mach/thread_act.d
index 78f9ee4eeaa..b61673fb4f1 100644
--- a/libphobos/libdruntime/core/sys/darwin/mach/thread_act.d
+++ b/libphobos/libdruntime/core/sys/darwin/mach/thread_act.d
@@ -34,6 +34,11 @@ version (X86)
     version = i386;
 version (X86_64)
     version = i386;
+version (AArch64)
+    version = AnyARM;
+version (ARM)
+    version = AnyARM;
+
 version (i386)
 {
     alias mach_port_t thread_act_t;
@@ -135,3 +140,98 @@ version (i386)
     kern_return_t thread_resume(thread_act_t);
     kern_return_t thread_get_state(thread_act_t, thread_state_flavor_t, thread_state_t*, mach_msg_type_number_t*);
 }
+// https://github.com/apple/darwin-xnu/blob/master/osfmk/mach/arm/_structs.h
+// https://github.com/apple/darwin-xnu/blob/master/osfmk/mach/arm/thread_status.h
+else version (AnyARM)
+{
+    alias thread_act_t = mach_port_t;
+    alias thread_state_t = void;
+    alias thread_state_flavor_t = int;
+    alias mach_msg_type_number_t = natural_t;
+
+    enum
+    {
+        ARM_THREAD_STATE = 1,
+        ARM_UNIFIED_THREAD_STATE = ARM_THREAD_STATE,
+        ARM_VFP_STATE = 2,
+        ARM_EXCEPTION_STATE = 3,
+        ARM_DEBUG_STATE = 4, /* pre-armv8 */
+        THREAD_STATE_NONE = 5,
+        ARM_THREAD_STATE64 = 6,
+        ARM_EXCEPTION_STATE64 = 7,
+        // ARM_THREAD_STATE_LAST = 8, /* legacy */
+        ARM_THREAD_STATE32 = 9
+    }
+
+    enum
+    {
+        ARM_DEBUG_STATE32 = 14,
+        ARM_DEBUG_STATE64 = 15,
+        ARM_NEON_STATE = 16,
+        ARM_NEON_STATE64 = 17,
+        ARM_CPMU_STATE64 = 18
+    }
+
+    enum
+    {
+        ARM_AMX_STATE = 24,
+        ARM_AMX_STATE_V1 = 25
+    }
+
+    struct arm_thread_state_t
+    {
+        uint[13] r; /// General purpose register r0-r12
+        uint sp;    /// Stack pointer r13
+        uint lr;    /// Link register r14
+        uint pc;    /// Program counter r15
+        uint cpsr;  /// Current program status register
+    }
+
+    alias arm_thread_state32_t = arm_thread_state_t;
+
+    struct arm_thread_state64_t
+    {
+        ulong[29] x; /// General purpose registers x0-x28
+        ulong fp; /// Frame pointer x29
+        ulong lr; /// Link register x30
+        ulong sp; /// Stack pointer x31
+        ulong pc; /// Program counter
+        ulong cpsr; /// Current program status register
+        ulong pad; /// Same size for 32-bit or 64-bit clients
+    }
+
+    struct arm_state_hdr_t
+    {
+        uint flavor;
+        uint count;
+    }
+
+    struct arm_unified_thread_state_t
+    {
+        arm_state_hdr_t ash;
+
+        union _uts
+        {
+            arm_thread_state32_t ts_32;
+            arm_thread_state64_t ts_64;
+        }
+
+        _uts uts;
+    }
+
+    enum : mach_msg_type_number_t
+    {
+        ARM_THREAD_STATE_COUNT = cast(mach_msg_type_number_t) (arm_thread_state_t.sizeof / uint.sizeof),
+        ARM_THREAD_STATE32_COUNT = cast(mach_msg_type_number_t) (arm_thread_state32_t.sizeof / uint.sizeof),
+        ARM_THREAD_STATE64_COUNT = cast(mach_msg_type_number_t) (arm_thread_state64_t.sizeof / uint.sizeof),
+        ARM_UNIFIED_THREAD_STATE_COUNT = cast(mach_msg_type_number_t) (arm_unified_thread_state_t.sizeof / uint.sizeof)
+    }
+
+    alias MACHINE_THREAD_STATE = ARM_THREAD_STATE;
+    alias MACHINE_THREAD_STATE_COUNT = ARM_UNIFIED_THREAD_STATE_COUNT;
+
+    mach_port_t   mach_thread_self();
+    kern_return_t thread_suspend(thread_act_t);
+    kern_return_t thread_resume(thread_act_t);
+    kern_return_t thread_get_state(thread_act_t, thread_state_flavor_t, thread_state_t*, mach_msg_type_number_t*);
+}
diff --git a/libphobos/libdruntime/core/sys/freebsd/dlfcn.d b/libphobos/libdruntime/core/sys/freebsd/dlfcn.d
index e390743692d..95b6c1dfbae 100644
--- a/libphobos/libdruntime/core/sys/freebsd/dlfcn.d
+++ b/libphobos/libdruntime/core/sys/freebsd/dlfcn.d
@@ -86,16 +86,13 @@ static if (__BSD_VISIBLE)
     };
 }
 
-private template __externC(RT, P...)
-{
-    alias __externC = extern(C) RT function(P) nothrow @nogc;
-}
-
 /* XSI functions first. */
-static assert(is(typeof(&dlclose) == __externC!(int, void*)));
-static assert(is(typeof(&dlerror) == __externC!(char*)));
-static assert(is(typeof(&dlopen)  == __externC!(void*, const char*, int)));
-static assert(is(typeof(&dlsym)   == __externC!(void*, void*, const char*)));
+extern(C) {
+    static assert(is(typeof(&dlclose) == int function(void*)));
+    static assert(is(typeof(&dlerror) == char* function()));
+    static assert(is(typeof(&dlopen)  == void* function(in char*, int)));
+    static assert(is(typeof(&dlsym)   == void* function(void*, in char*)));
+}
 
 static if (__BSD_VISIBLE)
 {
diff --git a/libphobos/libdruntime/core/sys/freebsd/execinfo.d b/libphobos/libdruntime/core/sys/freebsd/execinfo.d
index cbdf70219dc..125ef097d27 100644
--- a/libphobos/libdruntime/core/sys/freebsd/execinfo.d
+++ b/libphobos/libdruntime/core/sys/freebsd/execinfo.d
@@ -38,6 +38,8 @@ else
             asm nothrow @trusted { mov p[EBP], EBP; }
         else version (D_InlineAsm_X86_64)
             asm nothrow @trusted { mov p[RBP], RBP; }
+        else version (AArch64)
+            asm nothrow @trusted { "str x29, %0" : "=m" (p); }
         else
             static assert(false, "Architecture not supported.");
 
diff --git a/libphobos/libdruntime/core/sys/linux/config.d b/libphobos/libdruntime/core/sys/linux/config.d
index 96126674b01..03d3e17e166 100644
--- a/libphobos/libdruntime/core/sys/linux/config.d
+++ b/libphobos/libdruntime/core/sys/linux/config.d
@@ -27,6 +27,3 @@ deprecated("use _DEFAULT_SOURCE")
 enum __USE_MISC = _DEFAULT_SOURCE;
 enum __USE_ATFILE = _ATFILE_SOURCE;
 enum __USE_GNU = _GNU_SOURCE;
-
-// Available in bionic from API 21
-version (CRuntime_Bionic) enum __WORDSIZE = 32;
diff --git a/libphobos/libdruntime/core/sys/linux/link.d b/libphobos/libdruntime/core/sys/linux/link.d
index e242d2b2876..4d7eb1eb7d3 100644
--- a/libphobos/libdruntime/core/sys/linux/link.d
+++ b/libphobos/libdruntime/core/sys/linux/link.d
@@ -31,7 +31,15 @@ import core.sys.linux.dlfcn : Lmid_t;
 import core.sys.linux.elf;
 
 // <bits/elfclass.h>
-version (X86_Any)
+version (Android)
+{
+    alias __WORDSIZE __ELF_NATIVE_CLASS;
+    version (D_LP64)
+        alias uint64_t Elf_Symndx;
+    else
+        alias uint32_t Elf_Symndx;
+}
+else version (X86_Any)
 {
     // http://sourceware.org/git/?p=glibc.git;a=blob;f=bits/elfclass.h
     alias __WORDSIZE __ELF_NATIVE_CLASS;
diff --git a/libphobos/libdruntime/core/sys/linux/sys/netinet/tcp.d b/libphobos/libdruntime/core/sys/linux/sys/netinet/tcp.d
deleted file mode 100644
index d4957363951..00000000000
--- a/libphobos/libdruntime/core/sys/linux/sys/netinet/tcp.d
+++ /dev/null
@@ -1,9 +0,0 @@
-/**
- * D header file for GNU/Linux
- *
- * Authors: Martin Nowak
- */
-deprecated("Import core.sys.linux.netinet.tcp instead")
-module core.sys.linux.sys.netinet.tcp;
-
-public import core.sys.linux.netinet.tcp;
diff --git a/libphobos/libdruntime/core/sys/linux/sys/socket.d b/libphobos/libdruntime/core/sys/linux/sys/socket.d
index b8ad94c52d2..339a6022dc8 100644
--- a/libphobos/libdruntime/core/sys/linux/sys/socket.d
+++ b/libphobos/libdruntime/core/sys/linux/sys/socket.d
@@ -156,3 +156,21 @@ enum
     SO_PEERGROUPS              = 59,
     SO_ZEROCOPY                = 60,
 }
+
+enum : uint
+{
+    MSG_TRYHARD      = 0x04,
+    MSG_PROXY        = 0x10,
+    MSG_DONTWAIT     = 0x40,
+    MSG_FIN          = 0x200,
+    MSG_SYN          = 0x400,
+    MSG_CONFIRM      = 0x800,
+    MSG_RST          = 0x1000,
+    MSG_ERRQUEUE     = 0x2000,
+    MSG_MORE         = 0x8000,
+    MSG_WAITFORONE   = 0x10000,
+    MSG_BATCH        = 0x40000,
+    MSG_ZEROCOPY     = 0x4000000,
+    MSG_FASTOPEN     = 0x20000000,
+    MSG_CMSG_CLOEXEC = 0x40000000
+}
diff --git a/libphobos/libdruntime/core/sys/linux/timerfd.d b/libphobos/libdruntime/core/sys/linux/timerfd.d
index 047f257d98d..f8a9719a87e 100644
--- a/libphobos/libdruntime/core/sys/linux/timerfd.d
+++ b/libphobos/libdruntime/core/sys/linux/timerfd.d
@@ -20,5 +20,6 @@ int timerfd_settime(int fd, int flags, const itimerspec* new_value, itimerspec*
 int timerfd_gettime(int fd, itimerspec* curr_value);
 
 enum TFD_TIMER_ABSTIME = 1 << 0;
+enum TFD_TIMER_CANCEL_ON_SET = 1 << 1;
 enum TFD_CLOEXEC       = 0x80000;
 enum TFD_NONBLOCK      = 0x800;
diff --git a/libphobos/libdruntime/core/sys/posix/config.d b/libphobos/libdruntime/core/sys/posix/config.d
index 9ac42a130a0..20e711cb72d 100644
--- a/libphobos/libdruntime/core/sys/posix/config.d
+++ b/libphobos/libdruntime/core/sys/posix/config.d
@@ -61,9 +61,9 @@ version (CRuntime_Glibc)
     enum __USE_REENTRANT     = _REENTRANT;
 
     version (D_LP64)
-        enum __WORDSIZE=64;
+        enum __WORDSIZE = 64;
     else
-        enum __WORDSIZE=32;
+        enum __WORDSIZE = 32;
 }
 else version (CRuntime_Musl)
 {
@@ -109,13 +109,19 @@ else version (CRuntime_UClibc)
     enum __USE_REENTRANT     = _REENTRANT;
 
     version (D_LP64)
-        enum __WORDSIZE=64;
+        enum __WORDSIZE = 64;
     else
-        enum __WORDSIZE=32;
+        enum __WORDSIZE = 32;
 }
 else version (CRuntime_Bionic)
 {
-    enum __USE_GNU           = false;
+    enum _GNU_SOURCE         = false;
+    enum __USE_GNU           = _GNU_SOURCE;
+
+    version (D_LP64)
+        enum __WORDSIZE = 64;
+    else
+        enum __WORDSIZE = 32;
 }
 else version (OpenBSD)
 {
diff --git a/libphobos/libdruntime/core/sys/posix/dlfcn.d b/libphobos/libdruntime/core/sys/posix/dlfcn.d
index f36669dd0b3..11113d36269 100644
--- a/libphobos/libdruntime/core/sys/posix/dlfcn.d
+++ b/libphobos/libdruntime/core/sys/posix/dlfcn.d
@@ -126,20 +126,6 @@ version (CRuntime_Glibc)
     char* dlerror();
     void* dlopen(in char*, int);
     void* dlsym(void*, in char*);
-
-    deprecated("Please use core.sys.linux.dlfcn for non-POSIX extensions")
-    {
-        int   dladdr(in void* addr, Dl_info* info);
-        void* dlvsym(void* handle, in char* symbol, in char* version_);
-
-        struct Dl_info
-        {
-            const(char)* dli_fname;
-            void*        dli_fbase;
-            const(char)* dli_sname;
-            void*        dli_saddr;
-        }
-    }
 }
 else version (Darwin)
 {
diff --git a/libphobos/libdruntime/core/sys/posix/inttypes.d b/libphobos/libdruntime/core/sys/posix/inttypes.d
index e2954eda5cf..15863b4f35e 100644
--- a/libphobos/libdruntime/core/sys/posix/inttypes.d
+++ b/libphobos/libdruntime/core/sys/posix/inttypes.d
@@ -27,7 +27,7 @@ extern (C) nothrow @nogc:
 intmax_t  imaxabs(intmax_t);
 imaxdiv_t imaxdiv(intmax_t, intmax_t);
 intmax_t  strtoimax(in char*, char**, int);
-uintmax_t strtoumax(in char *, char**, int);
+uintmax_t strtoumax(in char*, char**, int);
 intmax_t  wcstoimax(in wchar_t*, wchar_t**, int);
 uintmax_t wcstoumax(in wchar_t*, wchar_t**, int);
 */
@@ -35,6 +35,6 @@ uintmax_t wcstoumax(in wchar_t*, wchar_t**, int);
 intmax_t  imaxabs(intmax_t);
 imaxdiv_t imaxdiv(intmax_t, intmax_t);
 intmax_t  strtoimax(in char*, char**, int);
-uintmax_t strtoumax(in char *, char**, int);
+uintmax_t strtoumax(in char*, char**, int);
 intmax_t  wcstoimax(in wchar_t*, wchar_t**, int);
 uintmax_t wcstoumax(in wchar_t*, wchar_t**, int);
diff --git a/libphobos/libdruntime/core/sys/posix/netdb.d b/libphobos/libdruntime/core/sys/posix/netdb.d
index 327387f68ea..f1251839b16 100644
--- a/libphobos/libdruntime/core/sys/posix/netdb.d
+++ b/libphobos/libdruntime/core/sys/posix/netdb.d
@@ -743,9 +743,7 @@ else version (Solaris)
         int ai_socktype;
         int ai_protocol;
 
-        version (SPARC)
-            int _ai_pad;
-        else version (SPARC64)
+        version (SPARC64)
             int _ai_pad;
 
         socklen_t ai_addrlen;
diff --git a/libphobos/libdruntime/core/sys/posix/signal.d b/libphobos/libdruntime/core/sys/posix/signal.d
index 5abcdac1355..9a97709b473 100644
--- a/libphobos/libdruntime/core/sys/posix/signal.d
+++ b/libphobos/libdruntime/core/sys/posix/signal.d
@@ -1142,10 +1142,10 @@ else version (FreeBSD)
     int sigdelset(sigset_t*, int);
     int sigemptyset(sigset_t *);
     int sigfillset(sigset_t *);
-    int sigismember(in sigset_t *, int);
+    int sigismember(in sigset_t*, int);
     int sigpending(sigset_t *);
     int sigprocmask(int, in sigset_t*, sigset_t*);
-    int sigsuspend(in sigset_t *);
+    int sigsuspend(in sigset_t*);
     int sigwait(in sigset_t*, int*);
 }
 else version (NetBSD)
@@ -1228,10 +1228,10 @@ else version (NetBSD)
     int __sigdelset14(sigset_t*, int);
     int __sigemptyset14(sigset_t *);
     int __sigfillset14(sigset_t *);
-    int __sigismember14(in sigset_t *, int);
+    int __sigismember14(in sigset_t*, int);
     int __sigpending14(sigset_t *);
     int __sigprocmask14(int, in sigset_t*, sigset_t*);
-    int __sigsuspend14(in sigset_t *);
+    int __sigsuspend14(in sigset_t*);
     int sigwait(in sigset_t*, int*);
 
     alias __sigaction14 sigaction;
@@ -1314,10 +1314,10 @@ else version (OpenBSD)
     int sigdelset(sigset_t*, int);
     int sigemptyset(sigset_t *);
     int sigfillset(sigset_t *);
-    int sigismember(in sigset_t *, int);
+    int sigismember(in sigset_t*, int);
     int sigpending(sigset_t *);
     int sigprocmask(int, in sigset_t*, sigset_t*);
-    int sigsuspend(in sigset_t *);
+    int sigsuspend(in sigset_t*);
     int sigwait(in sigset_t*, int*);
 }
 else version (DragonFlyBSD)
@@ -1363,10 +1363,10 @@ else version (DragonFlyBSD)
     int sigdelset(sigset_t*, int);
     int sigemptyset(sigset_t *);
     int sigfillset(sigset_t *);
-    int sigismember(in sigset_t *, int);
+    int sigismember(in sigset_t*, int);
     int sigpending(sigset_t *);
     int sigprocmask(int, in sigset_t*, sigset_t*);
-    int sigsuspend(in sigset_t *);
+    int sigsuspend(in sigset_t*);
     int sigwait(in sigset_t*, int*);
 }
 else version (Solaris)
@@ -3258,7 +3258,7 @@ else version (CRuntime_Musl)
     sigfn_t2 sigset(int sig, sigfn_t2 func);
 
     int killpg(pid_t, int);
-    int sigaltstack(const scope stack_t*, stack_t*);
+    int sigaltstack(in stack_t*, stack_t*);
     int sighold(int);
     int sigignore(int);
     int siginterrupt(int, int);
diff --git a/libphobos/libdruntime/core/sys/posix/stdio.d b/libphobos/libdruntime/core/sys/posix/stdio.d
index 0c6a144f520..bc2329e6bf8 100644
--- a/libphobos/libdruntime/core/sys/posix/stdio.d
+++ b/libphobos/libdruntime/core/sys/posix/stdio.d
@@ -180,6 +180,37 @@ else version (CRuntime_UClibc)
         FILE* tmpfile();
     }
 }
+else version (CRuntime_Musl)
+{
+    static if ( __USE_FILE_OFFSET64 )
+    {
+        int   fgetpos64(FILE*, fpos_t *);
+        alias fgetpos64 fgetpos;
+
+        FILE* fopen64(in char*, in char*);
+        alias fopen64 fopen;
+
+        FILE* freopen64(in char*, in char*, FILE*);
+        alias freopen64 freopen;
+
+        int   fseek(FILE*, c_long, int);
+
+        int   fsetpos64(FILE*, in fpos_t*);
+        alias fsetpos64 fsetpos;
+
+        FILE* tmpfile64();
+        alias tmpfile64 tmpfile;
+    }
+    else
+    {
+        int   fgetpos(FILE*, fpos_t *);
+        FILE* fopen(in char*, in char*);
+        FILE* freopen(in char*, in char*, FILE*);
+        int   fseek(FILE*, c_long, int);
+        int   fsetpos(FILE*, in fpos_t*);
+        FILE* tmpfile();
+    }
+}
 else version (Solaris)
 {
     static if (__USE_FILE_OFFSET64 && __WORDSIZE != 64)
@@ -277,6 +308,30 @@ else version (CRuntime_UClibc)
     off_t ftello(FILE*);
   }
 }
+else version (CRuntime_Musl)
+{
+    enum L_ctermid = 20;
+
+    static if ( __USE_FILE_OFFSET64 )
+    {
+        int   fseeko64(FILE*, off_t, int);
+        alias fseeko64 fseeko;
+    }
+    else
+    {
+        int   fseeko(FILE*, off_t, int);
+    }
+
+    static if ( __USE_FILE_OFFSET64 )
+    {
+        off_t ftello64(FILE*);
+        alias ftello64 ftello;
+    }
+    else
+    {
+        off_t ftello(FILE*);
+    }
+}
 else version (Solaris)
 {
     enum L_ctermid = 9;
@@ -331,6 +386,9 @@ else version (OpenBSD)                      // as of OpenBSD 5.4
     version = HaveMemstream;
 else version (CRuntime_UClibc)
     version = HaveMemstream;
+// http://git.musl-libc.org/cgit/musl/commit/src/stdio/open_memstream.c?id=b158b32a44d56ef20407d4285b58180447ffff1f
+else version (CRuntime_Musl)
+    version = HaveMemstream;
 
 version (HaveMemstream)
 {
diff --git a/libphobos/libdruntime/core/sys/posix/stdlib.d b/libphobos/libdruntime/core/sys/posix/stdlib.d
index dcd302739c1..a218f958077 100644
--- a/libphobos/libdruntime/core/sys/posix/stdlib.d
+++ b/libphobos/libdruntime/core/sys/posix/stdlib.d
@@ -574,9 +574,45 @@ else version (CRuntime_Bionic)
 }
 else version (CRuntime_Musl)
 {
-    char*  realpath(in char*, char*);
+    c_long a64l(in char*);
+    double drand48();
+    char*  ecvt(double, int, int *, int *); // LEGACY
+    double erand48(ref ushort[3]);
+    char*  fcvt(double, int, int *, int *); // LEGACY
+    char*  gcvt(double, int, char*); // LEGACY
+    int    getsubopt(char**, in char**, char**);
+    int    grantpt(int);
+    char*  initstate(uint, char*, size_t);
+    c_long jrand48(ref ushort[3]);
+    char*  l64a(c_long);
+    void   lcong48(ref ushort[7]);
+    c_long lrand48();
+    char*  mktemp(char*); // LEGACY
+    char*  mkdtemp(char*); // Defined in IEEE 1003.1, 2008 Edition
+    int    mkstemp(char*);
+    c_long mrand48();
+    c_long nrand48(ref ushort[3]);
+    int    posix_openpt(int);
+    char*  ptsname(int);
     int    putenv(char*);
+    c_long random();
+    char*  realpath(in char*, char*);
+    ushort *seed48(ref ushort[3]);
+    void   setkey(in char*);
+    char*  setstate(in char*);
+    void   srand48(c_long);
+    void   srandom(uint);
+    int    unlockpt(int);
+
+  static if ( __USE_LARGEFILE64 )
+  {
+    int    mkstemp64(char*);
+    alias  mkstemp64 mkstemp;
+  }
+  else
+  {
     int    mkstemp(char*);
+  }
 
 }
 else version (Solaris)
diff --git a/libphobos/libdruntime/core/sys/posix/sys/filio.d b/libphobos/libdruntime/core/sys/posix/sys/filio.d
index 0ca070b46ee..3574bc69ada 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/filio.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/filio.d
@@ -8,11 +8,20 @@ module core.sys.posix.sys.filio;
 
 import core.sys.posix.sys.ioccom;
 
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
+
 version (Posix):
 
 nothrow @nogc:
 
-version (OSX)
+version (Darwin)
 {
     // File-descriptor ioctl's
     enum uint FIOCLEX   = _IO('f', 1);         // set close on exec on fd
diff --git a/libphobos/libdruntime/core/sys/posix/sys/ioccom.d b/libphobos/libdruntime/core/sys/posix/sys/ioccom.d
index 424c8a82307..51f1d2272aa 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/ioccom.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/ioccom.d
@@ -6,11 +6,20 @@
 
 module core.sys.posix.sys.ioccom;
 
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
+
 version (Posix):
 
 nothrow @nogc:
 
-version (OSX)
+version (Darwin)
 {
     /* OSX ioctl's (based on FreeBSD) encode the command in the lower 16-bits
      * and the size of any in/out parameters in the lower 13 bits of the upper
diff --git a/libphobos/libdruntime/core/sys/posix/sys/resource.d b/libphobos/libdruntime/core/sys/posix/sys/resource.d
index 27a7ed28852..56a8fd428e8 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/resource.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/resource.d
@@ -525,6 +525,7 @@ else version (CRuntime_Bionic)
 else version (CRuntime_Musl)
 {
     alias ulong rlim_t;
+    enum RLIM_INFINITY = cast(c_ulong)(~0UL);
 
     int getrlimit(int, rlimit*);
     int setrlimit(int, in rlimit*);
diff --git a/libphobos/libdruntime/core/sys/posix/sys/select.d b/libphobos/libdruntime/core/sys/posix/sys/select.d
index 2508366d69c..83e47582f84 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/select.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/select.d
@@ -15,7 +15,6 @@ public import core.sys.posix.sys.types; // for time_t
 public import core.sys.posix.signal;    // for sigset_t
 
 //debug=select;  // uncomment to turn on debugging printf's
-version (unittest) import core.stdc.stdio: printf;
 
 version (OSX)
     version = Darwin;
@@ -560,6 +559,8 @@ else
 
 pure unittest
 {
+    import core.stdc.stdio: printf;
+
     debug(select) printf("core.sys.posix.sys.select unittest\n");
 
     fd_set fd;
diff --git a/libphobos/libdruntime/core/sys/posix/sys/socket.d b/libphobos/libdruntime/core/sys/posix/sys/socket.d
index 0732a48ab88..05f52fc76af 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/socket.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/socket.d
@@ -571,8 +571,8 @@ version (CRuntime_Glibc)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -580,10 +580,10 @@ version (CRuntime_Glibc)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -727,8 +727,8 @@ else version (Darwin)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -736,10 +736,10 @@ else version (Darwin)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -904,8 +904,8 @@ else version (FreeBSD)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -913,10 +913,10 @@ else version (FreeBSD)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -1101,8 +1101,8 @@ else version (NetBSD)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -1110,10 +1110,10 @@ else version (NetBSD)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -1274,8 +1274,8 @@ else version (OpenBSD)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -1283,10 +1283,10 @@ else version (OpenBSD)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -1655,8 +1655,8 @@ else version (Solaris)
     }
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -1664,10 +1664,10 @@ else version (Solaris)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     ssize_t recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    ssize_t sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    ssize_t sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
@@ -1816,8 +1816,8 @@ else version (CRuntime_Bionic)
     enum SOCK_RDM = 4;
 
     int     accept(int, scope sockaddr*, scope socklen_t*);
-    int     bind(int, const scope sockaddr*, socklen_t);
-    int     connect(int, const scope sockaddr*, socklen_t);
+    int     bind(int, in sockaddr*, socklen_t);
+    int     connect(int, in sockaddr*, socklen_t);
     int     getpeername(int, scope sockaddr*, scope socklen_t*);
     int     getsockname(int, scope sockaddr*, scope socklen_t*);
     int     getsockopt(int, int, int, scope void*, scope socklen_t*);
@@ -1825,10 +1825,10 @@ else version (CRuntime_Bionic)
     ssize_t recv(int, scope void*, size_t, int);
     ssize_t recvfrom(int, scope void*, size_t, int, scope sockaddr*, scope socklen_t*);
     int     recvmsg(int, scope msghdr*, int);
-    ssize_t send(int, const scope void*, size_t, int);
-    int     sendmsg(int, const scope msghdr*, int);
-    ssize_t sendto(int, const scope void*, size_t, int, const scope sockaddr*, socklen_t);
-    int     setsockopt(int, int, int, const scope void*, socklen_t);
+    ssize_t send(int, in void*, size_t, int);
+    int     sendmsg(int, in msghdr*, int);
+    ssize_t sendto(int, in void*, size_t, int, in sockaddr*, socklen_t);
+    int     setsockopt(int, int, int, in void*, socklen_t);
     int     shutdown(int, int) @safe;
     int     socket(int, int, int) @safe;
     int     sockatmark(int) @safe;
diff --git a/libphobos/libdruntime/core/sys/posix/sys/stat.d b/libphobos/libdruntime/core/sys/posix/sys/stat.d
index 52b51bd3c71..b0d57f28ee6 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/stat.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/stat.d
@@ -1391,7 +1391,6 @@ else version (Solaris)
             dev_t st_rdev;
             c_long[2] st_pad2;
             off_t st_size;
-            c_long st_pad3;
             union
             {
                 timestruc_t st_atim;
diff --git a/libphobos/libdruntime/core/sys/posix/sys/ttycom.d b/libphobos/libdruntime/core/sys/posix/sys/ttycom.d
index d1530979cca..38abb2fcf86 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/ttycom.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/ttycom.d
@@ -10,11 +10,20 @@ import core.sys.posix.sys.ioccom;
 import core.sys.posix.termios;
 import core.sys.posix.sys.time;
 
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
+
 version (Posix):
 
 nothrow @nogc:
 
-version (OSX)
+version (Darwin)
 {
     struct winsize {
         ushort  ws_row;     // rows, in characters
diff --git a/libphobos/libdruntime/core/sys/posix/sys/types.d b/libphobos/libdruntime/core/sys/posix/sys/types.d
index 169287c3bec..451c8b4fccc 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/types.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/types.d
@@ -852,7 +852,7 @@ else version (Darwin)
 {
     version (D_LP64)
     {
-        enum __PTHREAD_SIZE__               = 1168;
+        enum __PTHREAD_SIZE__               = 8176;
         enum __PTHREAD_ATTR_SIZE__          = 56;
         enum __PTHREAD_MUTEXATTR_SIZE__     = 8;
         enum __PTHREAD_MUTEX_SIZE__         = 56;
@@ -864,7 +864,7 @@ else version (Darwin)
     }
     else
     {
-        enum __PTHREAD_SIZE__               = 596;
+        enum __PTHREAD_SIZE__               = 4088;
         enum __PTHREAD_ATTR_SIZE__          = 36;
         enum __PTHREAD_MUTEXATTR_SIZE__     = 8;
         enum __PTHREAD_MUTEX_SIZE__         = 40;
diff --git a/libphobos/libdruntime/core/sys/posix/sys/uio.d b/libphobos/libdruntime/core/sys/posix/sys/uio.d
index c115bf17660..df34ef35c2a 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/uio.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/uio.d
@@ -138,8 +138,8 @@ else version (CRuntime_Musl)
 {
     struct iovec
     {
-        void* iov_base;
-        uint  iov_len;
+        void*  iov_base;
+        size_t iov_len;
     }
 
     ssize_t readv(int, in iovec*, int);
diff --git a/libphobos/libdruntime/core/sys/posix/syslog.d b/libphobos/libdruntime/core/sys/posix/syslog.d
index 64548fb0563..a319b01bd0d 100644
--- a/libphobos/libdruntime/core/sys/posix/syslog.d
+++ b/libphobos/libdruntime/core/sys/posix/syslog.d
@@ -526,3 +526,63 @@ else version (CRuntime_UClibc)
     void syslog (int __pri, const char *__fmt, ...);
     void closelog();
 }
+else version (CRuntime_Musl)
+{
+    //PRIORITY
+    enum {
+        LOG_EMERG = 0,     /* system is unusable */
+        LOG_ALERT = 1,     /* action must be taken immediately */
+        LOG_CRIT  = 2,     /* critical conditions */
+        LOG_ERR   = 3,     /* error conditions */
+        LOG_WARNING = 4,   /* warning conditions */
+        LOG_NOTICE  = 5,   /* normal but significant condition */
+        LOG_INFO    = 6,   /* informational */
+        LOG_DEBUG   = 7,   /* debug-level messages */
+    };
+
+    //OPTIONS
+    enum {
+        LOG_PID    = 0x01,  /* log the pid with each message */
+        LOG_CONS   = 0x02,  /* log on the console if errors in sending */
+        LOG_ODELAY = 0x04,  /* delay open until first syslog() (default) */
+        LOG_NDELAY = 0x08,  /* don't delay open */
+        LOG_NOWAIT = 0x10,  /* don't wait for console forks: DEPRECATED */
+        LOG_PERROR = 0x20,  /* log to stderr as well */
+    };
+
+    //FACILITY
+    enum {
+        LOG_KERN   = (0<<3),  /* kernel messages */
+        LOG_USER   = (1<<3),  /* random user-level messages */
+        LOG_MAIL   = (2<<3),  /* mail system */
+        LOG_DAEMON = (3<<3),  /* system daemons */
+        LOG_AUTH   = (4<<3),  /* security/authorization messages */
+        LOG_SYSLOG = (5<<3),  /* messages generated internally by syslogd */
+        LOG_LPR    = (6<<3),  /* line printer subsystem */
+        LOG_NEWS   = (7<<3),  /* network news subsystem */
+        LOG_UUCP   = (8<<3),  /* UUCP subsystem */
+        LOG_CRON   = (9<<3),  /* clock daemon */
+        LOG_AUTHPRIV = (10<<3), /* security/authorization messages (private), */
+        LOG_FTP    =  (11<<3), /* ftp daemon */
+
+        /* other codes through 15 reserved for system use */
+        LOG_LOCAL0 = (16<<3), /* reserved for local use */
+        LOG_LOCAL1 = (17<<3), /* reserved for local use */
+        LOG_LOCAL2 = (18<<3), /* reserved for local use */
+        LOG_LOCAL3 = (19<<3), /* reserved for local use */
+        LOG_LOCAL4 = (20<<3), /* reserved for local use */
+        LOG_LOCAL5 = (21<<3), /* reserved for local use */
+        LOG_LOCAL6 = (22<<3), /* reserved for local use */
+        LOG_LOCAL7 = (23<<3), /* reserved for local use */
+
+        LOG_NFACILITIES = 24,  /* current number of facilities */
+    };
+
+    int LOG_MASK(int pri) { return 1 << pri; }        /* mask for one priority */
+    int LOG_UPTO(int pri) { return (1 << (pri+1)) - 1; }  /* all priorities through pri */
+
+    void openlog (const char *, int __option, int __facility);
+    int  setlogmask (int __mask);
+    void syslog (int __pri, const char *__fmt, ...);
+    void closelog();
+}
diff --git a/libphobos/libdruntime/core/sys/posix/time.d b/libphobos/libdruntime/core/sys/posix/time.d
index 2859558b2b9..82a3f199247 100644
--- a/libphobos/libdruntime/core/sys/posix/time.d
+++ b/libphobos/libdruntime/core/sys/posix/time.d
@@ -624,6 +624,9 @@ else version (CRuntime_Bionic)
 }
 else version (CRuntime_Musl)
 {
+    extern __gshared int daylight;
+    extern __gshared c_long timezone;
+
     tm*   getdate(in char*);
     char* strptime(in char*, in char*, tm*);
 }
diff --git a/libphobos/libdruntime/core/sys/posix/unistd.d b/libphobos/libdruntime/core/sys/posix/unistd.d
index 6e035e54502..418d63d439b 100644
--- a/libphobos/libdruntime/core/sys/posix/unistd.d
+++ b/libphobos/libdruntime/core/sys/posix/unistd.d
@@ -1342,9 +1342,162 @@ else version (CRuntime_Bionic)
     enum W_OK       = 2;
     enum X_OK       = 1;
 
-    enum _SC_PAGESIZE         = 0x0027;
-    enum _SC_NPROCESSORS_ONLN = 0x0061;
-    enum _SC_THREAD_STACK_MIN = 0x004c;
+    enum
+    {
+        _SC_ARG_MAX             = 0x0000,
+        _SC_BC_BASE_MAX         = 0x0001,
+        _SC_BC_DIM_MAX          = 0x0002,
+        _SC_BC_SCALE_MAX        = 0x0003,
+        _SC_BC_STRING_MAX       = 0x0004,
+        _SC_CHILD_MAX           = 0x0005,
+        _SC_CLK_TCK             = 0x0006,
+        _SC_COLL_WEIGHTS_MAX    = 0x0007,
+        _SC_EXPR_NEST_MAX       = 0x0008,
+        _SC_LINE_MAX            = 0x0009,
+        _SC_NGROUPS_MAX         = 0x000a,
+        _SC_OPEN_MAX            = 0x000b,
+        _SC_PASS_MAX            = 0x000c,
+        _SC_2_C_BIND            = 0x000d,
+        _SC_2_C_DEV             = 0x000e,
+        _SC_2_C_VERSION         = 0x000f,
+        _SC_2_CHAR_TERM         = 0x0010,
+        _SC_2_FORT_DEV          = 0x0011,
+        _SC_2_FORT_RUN          = 0x0012,
+        _SC_2_LOCALEDEF         = 0x0013,
+        _SC_2_SW_DEV            = 0x0014,
+        _SC_2_UPE               = 0x0015,
+        _SC_2_VERSION           = 0x0016,
+        _SC_JOB_CONTROL         = 0x0017,
+        _SC_SAVED_IDS           = 0x0018,
+        _SC_VERSION             = 0x0019,
+        _SC_RE_DUP_MAX          = 0x001a,
+        _SC_STREAM_MAX          = 0x001b,
+        _SC_TZNAME_MAX          = 0x001c,
+        _SC_XOPEN_CRYPT         = 0x001d,
+        _SC_XOPEN_ENH_I18N      = 0x001e,
+        _SC_XOPEN_SHM           = 0x001f,
+        _SC_XOPEN_VERSION       = 0x0020,
+        _SC_XOPEN_XCU_VERSION   = 0x0021,
+        _SC_XOPEN_REALTIME      = 0x0022,
+        _SC_XOPEN_REALTIME_THREADS = 0x0023,
+        _SC_XOPEN_LEGACY        = 0x0024,
+        _SC_ATEXIT_MAX          = 0x0025,
+        _SC_IOV_MAX             = 0x0026,
+        _SC_UIO_MAXIOV          = _SC_IOV_MAX,
+        _SC_PAGESIZE            = 0x0027,
+        _SC_PAGE_SIZE           = 0x0028,
+        _SC_XOPEN_UNIX          = 0x0029,
+        _SC_XBS5_ILP32_OFF32    = 0x002a,
+        _SC_XBS5_ILP32_OFFBIG   = 0x002b,
+        _SC_XBS5_LP64_OFF64     = 0x002c,
+        _SC_XBS5_LPBIG_OFFBIG   = 0x002d,
+        _SC_AIO_LISTIO_MAX      = 0x002e,
+        _SC_AIO_MAX             = 0x002f,
+        _SC_AIO_PRIO_DELTA_MAX  = 0x0030,
+        _SC_DELAYTIMER_MAX      = 0x0031,
+        _SC_MQ_OPEN_MAX         = 0x0032,
+        _SC_MQ_PRIO_MAX         = 0x0033,
+        _SC_RTSIG_MAX           = 0x0034,
+        _SC_SEM_NSEMS_MAX       = 0x0035,
+        _SC_SEM_VALUE_MAX       = 0x0036,
+        _SC_SIGQUEUE_MAX        = 0x0037,
+        _SC_TIMER_MAX           = 0x0038,
+        _SC_ASYNCHRONOUS_IO     = 0x0039,
+        _SC_FSYNC               = 0x003a,
+        _SC_MAPPED_FILES        = 0x003b,
+        _SC_MEMLOCK             = 0x003c,
+        _SC_MEMLOCK_RANGE       = 0x003d,
+        _SC_MEMORY_PROTECTION   = 0x003e,
+        _SC_MESSAGE_PASSING     = 0x003f,
+        _SC_PRIORITIZED_IO      = 0x0040,
+        _SC_PRIORITY_SCHEDULING = 0x0041,
+        _SC_REALTIME_SIGNALS    = 0x0042,
+        _SC_SEMAPHORES          = 0x0043,
+        _SC_SHARED_MEMORY_OBJECTS = 0x0044,
+        _SC_SYNCHRONIZED_IO     = 0x0045,
+        _SC_TIMERS              = 0x0046,
+        _SC_GETGR_R_SIZE_MAX    = 0x0047,
+        _SC_GETPW_R_SIZE_MAX    = 0x0048,
+        _SC_LOGIN_NAME_MAX      = 0x0049,
+        _SC_THREAD_DESTRUCTOR_ITERATIONS = 0x004a,
+        _SC_THREAD_KEYS_MAX     = 0x004b,
+        _SC_THREAD_STACK_MIN    = 0x004c,
+        _SC_THREAD_THREADS_MAX  = 0x004d,
+        _SC_TTY_NAME_MAX        = 0x004e,
+
+        _SC_THREADS                    = 0x004f,
+        _SC_THREAD_ATTR_STACKADDR      = 0x0050,
+        _SC_THREAD_ATTR_STACKSIZE      = 0x0051,
+        _SC_THREAD_PRIORITY_SCHEDULING = 0x0052,
+        _SC_THREAD_PRIO_INHERIT        = 0x0053,
+        _SC_THREAD_PRIO_PROTECT        = 0x0054,
+        _SC_THREAD_SAFE_FUNCTIONS      = 0x0055,
+
+        _SC_NPROCESSORS_CONF           = 0x0060,
+        _SC_NPROCESSORS_ONLN           = 0x0061,
+        _SC_PHYS_PAGES                 = 0x0062,
+        _SC_AVPHYS_PAGES               = 0x0063,
+        _SC_MONOTONIC_CLOCK            = 0x0064,
+
+        _SC_2_PBS               = 0x0065,
+        _SC_2_PBS_ACCOUNTING    = 0x0066,
+        _SC_2_PBS_CHECKPOINT    = 0x0067,
+        _SC_2_PBS_LOCATE        = 0x0068,
+        _SC_2_PBS_MESSAGE       = 0x0069,
+        _SC_2_PBS_TRACK         = 0x006a,
+        _SC_ADVISORY_INFO       = 0x006b,
+        _SC_BARRIERS            = 0x006c,
+        _SC_CLOCK_SELECTION     = 0x006d,
+        _SC_CPUTIME             = 0x006e,
+        _SC_HOST_NAME_MAX       = 0x006f,
+        _SC_IPV6                = 0x0070,
+        _SC_RAW_SOCKETS         = 0x0071,
+        _SC_READER_WRITER_LOCKS = 0x0072,
+        _SC_REGEXP              = 0x0073,
+        _SC_SHELL               = 0x0074,
+        _SC_SPAWN               = 0x0075,
+        _SC_SPIN_LOCKS          = 0x0076,
+        _SC_SPORADIC_SERVER     = 0x0077,
+        _SC_SS_REPL_MAX         = 0x0078,
+        _SC_SYMLOOP_MAX         = 0x0079,
+        _SC_THREAD_CPUTIME      = 0x007a,
+        _SC_THREAD_PROCESS_SHARED      = 0x007b,
+        _SC_THREAD_ROBUST_PRIO_INHERIT = 0x007c,
+        _SC_THREAD_ROBUST_PRIO_PROTECT = 0x007d,
+        _SC_THREAD_SPORADIC_SERVER     = 0x007e,
+        _SC_TIMEOUTS            = 0x007f,
+        _SC_TRACE               = 0x0080,
+        _SC_TRACE_EVENT_FILTER  = 0x0081,
+        _SC_TRACE_EVENT_NAME_MAX = 0x0082,
+        _SC_TRACE_INHERIT       = 0x0083,
+        _SC_TRACE_LOG           = 0x0084,
+        _SC_TRACE_NAME_MAX      = 0x0085,
+        _SC_TRACE_SYS_MAX       = 0x0086,
+        _SC_TRACE_USER_EVENT_MAX = 0x0087,
+        _SC_TYPED_MEMORY_OBJECTS = 0x0088,
+        _SC_V7_ILP32_OFF32      = 0x0089,
+        _SC_V7_ILP32_OFFBIG     = 0x008a,
+        _SC_V7_LP64_OFF64       = 0x008b,
+        _SC_V7_LPBIG_OFFBIG     = 0x008c,
+        _SC_XOPEN_STREAMS       = 0x008d,
+        _SC_XOPEN_UUCP          = 0x008e,
+
+        _SC_LEVEL1_ICACHE_SIZE     = 0x008f,
+        _SC_LEVEL1_ICACHE_ASSOC    = 0x0090,
+        _SC_LEVEL1_ICACHE_LINESIZE = 0x0091,
+        _SC_LEVEL1_DCACHE_SIZE     = 0x0092,
+        _SC_LEVEL1_DCACHE_ASSOC    = 0x0093,
+        _SC_LEVEL1_DCACHE_LINESIZE = 0x0094,
+        _SC_LEVEL2_CACHE_SIZE      = 0x0095,
+        _SC_LEVEL2_CACHE_ASSOC     = 0x0096,
+        _SC_LEVEL2_CACHE_LINESIZE  = 0x0097,
+        _SC_LEVEL3_CACHE_SIZE      = 0x0098,
+        _SC_LEVEL3_CACHE_ASSOC     = 0x0099,
+        _SC_LEVEL3_CACHE_LINESIZE  = 0x009a,
+        _SC_LEVEL4_CACHE_SIZE      = 0x009b,
+        _SC_LEVEL4_CACHE_ASSOC     = 0x009c,
+        _SC_LEVEL4_CACHE_LINESIZE  = 0x009d,
+    }
 }
 else version (Solaris)
 {
@@ -2403,7 +2556,7 @@ else version (OpenBSD)
 {
     char*      crypt(in char*, in char*);
     //char*      ctermid(char*);
-    void       encrypt(ref char[64], int) @trusted;
+    //void       encrypt(ref char[64], int) @trusted;
     int        fchdir(int) @trusted;
     c_long     gethostid() @trusted;
     pid_t      getpgid(pid_t) @trusted;
