diff --git a/hurd/hurd.h b/hurd/hurd.h
index f302e04..36cd4b6 100644
--- a/hurd/hurd.h
+++ b/hurd/hurd.h
@@ -46,6 +46,9 @@
 #define _HURD_H_EXTERN_INLINE __extern_inline
 #endif
 
+int __hurd_fail (error_t err);
+
+#ifdef __USE_EXTERN_INLINES
 _HURD_H_EXTERN_INLINE int
 __hurd_fail (error_t err)
 {
@@ -75,6 +78,7 @@ __hurd_fail (error_t err)
   errno = err;
   return -1;
 }
+#endif
 
 /* Basic ports and info, initialized by startup.  */
 
diff --git a/hurd/hurd/fd.h b/hurd/hurd/fd.h
index 7b13719..eaaa332 100644
--- a/hurd/hurd/fd.h
+++ b/hurd/hurd/fd.h
@@ -58,6 +58,9 @@ extern struct mutex _hurd_dtable_lock; /* Locks those two variables.  */
    NULL.  The cell is unlocked; when ready to use it, lock it and check for
    it being unused.  */
 
+struct hurd_fd *_hurd_fd_get (int fd);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_FD_H_EXTERN_INLINE struct hurd_fd *
 _hurd_fd_get (int fd)
 {
@@ -90,6 +93,7 @@ _hurd_fd_get (int fd)
 
   return descriptor;
 }
+#endif
 
 
 /* Evaluate EXPR with the variable `descriptor' bound to a pointer to the
@@ -137,6 +141,9 @@ _hurd_fd_get (int fd)
 /* Check if ERR should generate a signal.
    Returns the signal to take, or zero if none.  */
 
+int _hurd_fd_error_signal (error_t err);
+
+#ifdef __USE_EXTERN_INLINES
 _HURD_FD_H_EXTERN_INLINE int
 _hurd_fd_error_signal (error_t err)
 {
@@ -153,11 +160,15 @@ _hurd_fd_error_signal (error_t err)
       return 0;
     }
 }
+#endif
 
 /* Handle an error from an RPC on a file descriptor's port.  You should
    always use this function to handle errors from RPCs made on file
    descriptor ports.  Some errors are translated into signals.  */
 
+error_t _hurd_fd_error (int fd, error_t err);
+
+#ifdef __USE_EXTERN_INLINES
 _HURD_FD_H_EXTERN_INLINE error_t
 _hurd_fd_error (int fd, error_t err)
 {
@@ -170,20 +181,28 @@ _hurd_fd_error (int fd, error_t err)
     }
   return err;
 }
+#endif
 
 /* Handle error code ERR from an RPC on file descriptor FD's port.
    Set `errno' to the appropriate error code, and always return -1.  */
 
+int __hurd_dfail (int fd, error_t err);
+
+#ifdef __USE_EXTERN_INLINES
 _HURD_FD_H_EXTERN_INLINE int
 __hurd_dfail (int fd, error_t err)
 {
   errno = _hurd_fd_error (fd, err);
   return -1;
 }
+#endif
 
 /* Likewise, but do not raise SIGPIPE on EPIPE if flags contain
    MSG_NOSIGNAL.  */
 
+int __hurd_sockfail (int fd, int flags, error_t err);
+
+#ifdef __USE_EXTERN_INLINES
 _HURD_FD_H_EXTERN_INLINE int
 __hurd_sockfail (int fd, int flags, error_t err)
 {
@@ -192,6 +211,7 @@ __hurd_sockfail (int fd, int flags, error_t err)
   errno = err;
   return -1;
 }
+#endif
 
 /* Set up *FD to have PORT its server port, doing appropriate ctty magic.
    Does no locking or unlocking.  */
diff --git a/hurd/hurd/port.h b/hurd/hurd/port.h
index 3935752..810bb31 100644
--- a/hurd/hurd/port.h
+++ b/hurd/hurd/port.h
@@ -60,6 +60,9 @@ struct hurd_port
 
 /* Initialize *PORT to INIT.  */
 
+void _hurd_port_init (struct hurd_port *port, mach_port_t init);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE void
 _hurd_port_init (struct hurd_port *port, mach_port_t init)
 {
@@ -67,6 +70,7 @@ _hurd_port_init (struct hurd_port *port, mach_port_t init)
   port->users = NULL;
   port->port = init;
 }
+#endif
 
 
 /* Cleanup function for non-local exits.  */
@@ -75,6 +79,11 @@ extern void _hurd_port_cleanup (void *, jmp_buf, int);
 /* Get a reference to *PORT, which is locked.
    Pass return value and LINK to _hurd_port_free when done.  */
 
+mach_port_t
+_hurd_port_locked_get (struct hurd_port *port,
+		       struct hurd_userlink *link);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE mach_port_t
 _hurd_port_locked_get (struct hurd_port *port,
 		       struct hurd_userlink *link)
@@ -90,9 +99,15 @@ _hurd_port_locked_get (struct hurd_port *port,
   __spin_unlock (&port->lock);
   return result;
 }
+#endif
 
 /* Same, but locks PORT first.  */
 
+mach_port_t
+_hurd_port_get (struct hurd_port *port,
+		struct hurd_userlink *link);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE mach_port_t
 _hurd_port_get (struct hurd_port *port,
 		struct hurd_userlink *link)
@@ -104,10 +119,17 @@ _hurd_port_get (struct hurd_port *port,
   HURD_CRITICAL_END;
   return result;
 }
+#endif
 
 
 /* Free a reference gotten with `USED_PORT = _hurd_port_get (PORT, LINK);' */
 
+void
+_hurd_port_free (struct hurd_port *port,
+		 struct hurd_userlink *link,
+		 mach_port_t used_port);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE void
 _hurd_port_free (struct hurd_port *port,
 		 struct hurd_userlink *link,
@@ -127,11 +149,15 @@ _hurd_port_free (struct hurd_port *port,
   if (dealloc)
     __mach_port_deallocate (__mach_task_self (), used_port);
 }
+#endif
 
 
 /* Set *PORT's port to NEWPORT.  NEWPORT's reference is consumed by PORT->port.
    PORT->lock is locked.  */
 
+void _hurd_port_locked_set (struct hurd_port *port, mach_port_t newport);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE void
 _hurd_port_locked_set (struct hurd_port *port, mach_port_t newport)
 {
@@ -142,9 +168,13 @@ _hurd_port_locked_set (struct hurd_port *port, mach_port_t newport)
   if (old != MACH_PORT_NULL)
     __mach_port_deallocate (__mach_task_self (), old);
 }
+#endif
 
 /* Same, but locks PORT first.  */
 
+void _hurd_port_set (struct hurd_port *port, mach_port_t newport);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_PORT_H_EXTERN_INLINE void
 _hurd_port_set (struct hurd_port *port, mach_port_t newport)
 {
@@ -153,6 +183,7 @@ _hurd_port_set (struct hurd_port *port, mach_port_t newport)
   _hurd_port_locked_set (port, newport);
   HURD_CRITICAL_END;
 }
+#endif
 
 
 #endif	/* hurd/port.h */
diff --git a/hurd/hurd/signal.h b/hurd/hurd/signal.h
index d4079ef..e8f3da2 100644
--- a/hurd/hurd/signal.h
+++ b/hurd/hurd/signal.h
@@ -129,6 +129,7 @@ extern struct hurd_sigstate *_hurd_self_sigstate (void)
 #define _HURD_SIGNAL_H_EXTERN_INLINE __extern_inline
 #endif
 
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_SIGNAL_H_EXTERN_INLINE struct hurd_sigstate *
 _hurd_self_sigstate (void)
 {
@@ -138,6 +139,7 @@ _hurd_self_sigstate (void)
     *location = _hurd_thread_sigstate (__mach_thread_self ());
   return *location;
 }
+#endif
 
 /* Thread listening on our message port; also called the "signal thread".  */
 
@@ -164,6 +166,9 @@ extern int _hurd_core_limit;
    interrupted lest the signal handler try to take the same lock and
    deadlock result.  */
 
+void *_hurd_critical_section_lock (void);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_SIGNAL_H_EXTERN_INLINE void *
 _hurd_critical_section_lock (void)
 {
@@ -189,7 +194,11 @@ _hurd_critical_section_lock (void)
      _hurd_critical_section_unlock to unlock it.  */
   return ss;
 }
+#endif
 
+void _hurd_critical_section_unlock (void *our_lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_SIGNAL_H_EXTERN_INLINE void
 _hurd_critical_section_unlock (void *our_lock)
 {
@@ -212,6 +221,7 @@ _hurd_critical_section_unlock (void *our_lock)
 	__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
     }
 }
+#endif
 
 /* Convenient macros for simple uses of critical sections.
    These two must be used as a pair at the same C scoping level.  */
diff --git a/hurd/hurd/threadvar.h b/hurd/hurd/threadvar.h
index 786db14..93e91ec 100644
--- a/hurd/hurd/threadvar.h
+++ b/hurd/hurd/threadvar.h
@@ -81,6 +81,8 @@ enum __hurd_threadvar_index
 
 extern unsigned long int *__hurd_threadvar_location_from_sp
   (enum __hurd_threadvar_index __index, void *__sp);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_THREADVAR_H_EXTERN_INLINE unsigned long int *
 __hurd_threadvar_location_from_sp (enum __hurd_threadvar_index __index,
 				   void *__sp)
@@ -92,6 +94,7 @@ __hurd_threadvar_location_from_sp (enum __hurd_threadvar_index __index,
 	   : (unsigned long int *) ((__stack & __hurd_threadvar_stack_mask) +
 				    __hurd_threadvar_stack_offset))[__index];
 }
+#endif
 
 #include <machine-sp.h>		/* Define __thread_stack_pointer.  */
 
@@ -105,12 +108,14 @@ __hurd_threadvar_location (enum __hurd_threadvar_index __index) __THROW
 	the same stack frame by different threads.  */
      __attribute__ ((__const__));
 
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_THREADVAR_H_EXTERN_INLINE unsigned long int *
 __hurd_threadvar_location (enum __hurd_threadvar_index __index)
 {
   return __hurd_threadvar_location_from_sp (__index,
 					    __thread_stack_pointer ());
 }
+#endif
 
 
 #endif	/* hurd/threadvar.h */
diff --git a/hurd/hurd/userlink.h b/hurd/hurd/userlink.h
index 391898a..bd0a8c2 100644
--- a/hurd/hurd/userlink.h
+++ b/hurd/hurd/userlink.h
@@ -76,6 +76,11 @@ struct hurd_userlink
 
 /* Attach LINK to the chain of users at *CHAINP.  */
 
+void
+_hurd_userlink_link (struct hurd_userlink **chainp,
+		     struct hurd_userlink *link);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_USERLINK_H_EXTERN_INLINE void
 _hurd_userlink_link (struct hurd_userlink **chainp,
 		     struct hurd_userlink *link)
@@ -96,11 +101,15 @@ _hurd_userlink_link (struct hurd_userlink **chainp,
   link->thread.prevp = thread_chainp;
   *thread_chainp = link;
 }
+#endif
 
 
 /* Detach LINK from its chain.  Returns nonzero iff this was the
    last user of the resource and it should be deallocated.  */
 
+int _hurd_userlink_unlink (struct hurd_userlink *link);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_USERLINK_H_EXTERN_INLINE int
 _hurd_userlink_unlink (struct hurd_userlink *link)
 {
@@ -123,6 +132,7 @@ _hurd_userlink_unlink (struct hurd_userlink *link)
 
   return dealloc;
 }
+#endif
 
 
 /* Clear all users from *CHAINP.  Call this when the resource *CHAINP
@@ -131,6 +141,9 @@ _hurd_userlink_unlink (struct hurd_userlink *link)
    value is zero, someone is still using the resource and they will
    deallocate it when they are finished.  */
 
+int _hurd_userlink_clear (struct hurd_userlink **chainp);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC && !defined NOT_IN_libc
 _HURD_USERLINK_H_EXTERN_INLINE int
 _hurd_userlink_clear (struct hurd_userlink **chainp)
 {
@@ -143,5 +156,6 @@ _hurd_userlink_clear (struct hurd_userlink **chainp)
   *chainp = NULL;
   return 0;
 }
+#endif
 
 #endif	/* hurd/userlink.h */
diff --git a/mach/lock-intern.h b/mach/lock-intern.h
index 0a5df7a..f6e2082 100644
--- a/mach/lock-intern.h
+++ b/mach/lock-intern.h
@@ -28,11 +28,15 @@
 
 /* Initialize LOCK.  */
 
+void __spin_lock_init (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __spin_lock_init (__spin_lock_t *__lock)
 {
   *__lock = __SPIN_LOCK_INITIALIZER;
 }
+#endif
 
 
 /* Lock LOCK, blocking if we can't get it.  */
@@ -40,12 +44,16 @@ extern void __spin_lock_solid (__spin_lock_t *__lock);
 
 /* Lock the spin lock LOCK.  */
 
+void __spin_lock (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __spin_lock (__spin_lock_t *__lock)
 {
   if (! __spin_try_lock (__lock))
     __spin_lock_solid (__lock);
 }
+#endif
 
 /* Name space-clean internal interface to mutex locks.
 
@@ -70,27 +78,39 @@ extern void __mutex_unlock_solid (void *__lock);
 
 /* Lock the mutex lock LOCK.  */
 
+void __mutex_lock (void *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __mutex_lock (void *__lock)
 {
   if (! __spin_try_lock ((__spin_lock_t *) __lock))
     __mutex_lock_solid (__lock);
 }
+#endif
 
 /* Unlock the mutex lock LOCK.  */
 
+void __mutex_unlock (void *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __mutex_unlock (void *__lock)
 {
   __spin_unlock ((__spin_lock_t *) __lock);
   __mutex_unlock_solid (__lock);
 }
+#endif
 
 
+int __mutex_trylock (void *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE int
 __mutex_trylock (void *__lock)
 {
   return __spin_try_lock ((__spin_lock_t *) __lock);
 }
+#endif
 
 #endif /* lock-intern.h */
diff --git a/mach/mach/mig_support.h b/mach/mach/mig_support.h
index d73eafc..2c0893a 100644
--- a/mach/mach/mig_support.h
+++ b/mach/mach/mig_support.h
@@ -66,6 +66,8 @@ extern void mig_reply_setup (const mach_msg_header_t *__request,
 /* Idiocy support function.  */
 extern vm_size_t mig_strncpy (char *__dst, const char *__src, vm_size_t __len);
 extern vm_size_t __mig_strncpy (char *__dst, const char *__src, vm_size_t);
+
+#ifdef __USE_EXTERN_INLINES
 __extern_inline vm_size_t
 __mig_strncpy (char *__dst, const char *__src, vm_size_t __len)
 {
@@ -76,6 +78,7 @@ mig_strncpy (char *__dst, const char *__src, vm_size_t __len)
 {
   return __mig_strncpy (__dst, __src, __len);
 }
+#endif
 
 
 
diff --git a/mach/spin-lock.c b/mach/spin-lock.c
index aaebc55..1b1e69c 100644
--- a/mach/spin-lock.c
+++ b/mach/spin-lock.c
@@ -1,3 +1,4 @@
+#define __USE_EXTERN_INLINES 1
 #define _EXTERN_INLINE /* Empty to define the real functions.  */
 #include "spin-lock.h"
 
diff --git a/sysdeps/generic/machine-lock.h b/sysdeps/generic/machine-lock.h
index 6aad932..d7ccbe4 100644
--- a/sysdeps/generic/machine-lock.h
+++ b/sysdeps/generic/machine-lock.h
@@ -34,14 +34,21 @@ typedef volatile int __spin_lock_t;
 
 /* Unlock LOCK.  */
 
+void __spin_unlock (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __spin_unlock (__spin_lock_t *__lock)
 {
   *__lock = 0;
 }
+#endif
 
 /* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
 
+int __spin_try_lock (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE int
 __spin_try_lock (__spin_lock_t *__lock)
 {
@@ -50,14 +57,19 @@ __spin_try_lock (__spin_lock_t *__lock)
   *__lock = 1;
   return 1;
 }
+#endif
 
 /* Return nonzero if LOCK is locked.  */
 
+int __spin_lock_locked (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE int
 __spin_lock_locked (__spin_lock_t *__lock)
 {
   return *__lock != 0;
 }
+#endif
 
 
 #endif /* machine-lock.h */
diff --git a/sysdeps/generic/machine-sp.h b/sysdeps/generic/machine-sp.h
index 4fe208c..57f04f2 100644
--- a/sysdeps/generic/machine-sp.h
+++ b/sysdeps/generic/machine-sp.h
@@ -25,11 +25,15 @@
 #define _EXTERN_INLINE __extern_inline
 #endif
 
+void * __thread_stack_pointer (void);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void *
 __thread_stack_pointer (void)
 {
   register void *__sp__ ("{STACK-POINTER}");
   return __sp__;
 }
+#endif
 
 #endif	/* machine-sp.h */
diff --git a/sysdeps/mach/i386/machine-lock.h b/sysdeps/mach/i386/machine-lock.h
index 9b25c8c..13fa93e 100644
--- a/sysdeps/mach/i386/machine-lock.h
+++ b/sysdeps/mach/i386/machine-lock.h
@@ -34,6 +34,9 @@ typedef volatile int __spin_lock_t;
 
 /* Unlock LOCK.  */
 
+void __spin_unlock (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE void
 __spin_unlock (__spin_lock_t *__lock)
 {
@@ -42,9 +45,13 @@ __spin_unlock (__spin_lock_t *__lock)
 		       : "=&r" (__unlocked), "=m" (*__lock) : "0" (0)
 		       : "memory");
 }
+#endif
 
 /* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
 
+int __spin_try_lock (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE int
 __spin_try_lock (__spin_lock_t *__lock)
 {
@@ -54,14 +61,19 @@ __spin_try_lock (__spin_lock_t *__lock)
 		      : "memory");
   return !__locked;
 }
+#endif
 
 /* Return nonzero if LOCK is locked.  */
 
+int __spin_lock_locked (__spin_lock_t *__lock);
+
+#ifdef __USE_EXTERN_INLINES
 _EXTERN_INLINE int
 __spin_lock_locked (__spin_lock_t *__lock)
 {
   return *__lock != 0;
 }
+#endif
 
 
 #endif /* machine-lock.h */
