diff --git a/math/s_ctanhl.c b/math/s_ctanhl.c
index 016ebc5..fa11db7 100644
--- a/math/s_ctanhl.c
+++ b/math/s_ctanhl.c
@@ -23,6 +23,13 @@
 #include <math_private.h>
 #include <float.h>
 
+/* To avoid spurious underflows, use this definition to treat IBM long
+   double as approximating an IEEE-style format.  */
+#if LDBL_MANT_DIG == 106
+# undef LDBL_EPSILON
+# define LDBL_EPSILON 0x1p-106L
+#endif
+
 __complex__ long double
 __ctanhl (__complex__ long double x)
 {
diff --git a/math/s_ctanl.c b/math/s_ctanl.c
index 6ad1b75..1f92755 100644
--- a/math/s_ctanl.c
+++ b/math/s_ctanl.c
@@ -23,6 +23,13 @@
 #include <math_private.h>
 #include <float.h>
 
+/* To avoid spurious underflows, use this definition to treat IBM long
+   double as approximating an IEEE-style format.  */
+#if LDBL_MANT_DIG == 106
+# undef LDBL_EPSILON
+# define LDBL_EPSILON 0x1p-106L
+#endif
+
 __complex__ long double
 __ctanl (__complex__ long double x)
 {
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_cprojl.c b/sysdeps/ieee754/ldbl-128ibm/s_cprojl.c
deleted file mode 100644
index 4243a4b..0000000
--- a/sysdeps/ieee754/ldbl-128ibm/s_cprojl.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/* Compute projection of complex long double value to Riemann sphere.
-   Copyright (C) 1997-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <complex.h>
-#include <math.h>
-#include <math_ldbl_opt.h>
-
-__complex__ long double
-__cprojl (__complex__ long double x)
-{
-  if (__isinf_nsl (__real__ x) || __isinf_nsl (__imag__ x))
-    {
-      __complex__ long double res;
-
-      __real__ res = INFINITY;
-      __imag__ res = __copysignl (0.0, __imag__ x);
-
-      return res;
-    }
-
-  return x;
-}
-long_double_symbol (libm, __cprojl, cprojl);
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_ctanhl.c b/sysdeps/ieee754/ldbl-128ibm/s_ctanhl.c
deleted file mode 100644
index 96bdccd..0000000
--- a/sysdeps/ieee754/ldbl-128ibm/s_ctanhl.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/* Complex hyperbole tangent for long double.  IBM extended format version.
-   Copyright (C) 1997-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <complex.h>
-#include <fenv.h>
-#include <float.h>
-#include <math.h>
-#include <math_ldbl_opt.h>
-
-#include <math_private.h>
-
-/* IBM long double GCC builtin sets LDBL_EPSILON == LDBL_DENORM_MIN  */
-static const long double ldbl_eps =  0x1p-106L;
-
-__complex__ long double
-__ctanhl (__complex__ long double x)
-{
-  __complex__ long double res;
-
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
-    {
-      if (isinf (__real__ x))
-	{
-	  __real__ res = __copysignl (1.0L, __real__ x);
-	  __imag__ res = __copysignl (0.0L, __imag__ x);
-	}
-      else if (__imag__ x == 0.0)
-	{
-	  res = x;
-	}
-      else
-	{
-	  __real__ res = __nanl ("");
-	  __imag__ res = __nanl ("");
-
-#ifdef FE_INVALID
-	  if (isinf (__imag__ x))
-	    feraiseexcept (FE_INVALID);
-#endif
-	}
-    }
-  else
-    {
-      long double sinix, cosix;
-      long double den;
-      const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l / 2.0L);
-
-      /* tanh(x+iy) = (sinh(2x) + i*sin(2y))/(cosh(2x) + cos(2y))
-        = (sinh(x)*cosh(x) + i*sin(y)*cos(y))/(sinh(x)^2 + cos(y)^2).  */
-
-      __sincosl (__imag__ x, &sinix, &cosix);
-
-      if (fabsl (__real__ x) > t)
-	{
-	  /* Avoid intermediate overflow when the imaginary part of
-	     the result may be subnormal.  Ignoring negligible terms,
-	     the real part is +/- 1, the imaginary part is
-	     sin(y)*cos(y)/sinh(x)^2 = 4*sin(y)*cos(y)/exp(2x).  */
-	  long double exp_2t = __ieee754_expl (2 * t);
-	  __real__ res = __copysignl (1.0L, __real__ x);
-	  __imag__ res = 4 * sinix * cosix;
-	  __real__ x = fabsl (__real__ x);
-	  __real__ x -= t;
-	  __imag__ res /= exp_2t;
-	  if (__real__ x > t)
-	    {
-	      /* Underflow (original real part of x has absolute value
-		 > 2t).  */
-	      __imag__ res /= exp_2t;
-	    }
-	  else
-	    __imag__ res /= __ieee754_expl (2.0L * __real__ x);
-	}
-      else
-	{
-	  long double sinhrx, coshrx;
-	  if (fabs (__real__ x) > LDBL_MIN)
-	    {
-	      sinhrx = __ieee754_sinhl (__real__ x);
-	      coshrx = __ieee754_coshl (__real__ x);
-	    }
-	  else
-	    {
-	      sinhrx = __real__ x;
-	      coshrx = 1.0L;
-	    }
-
-	  if (fabsl (sinhrx) > fabsl (cosix) * ldbl_eps)
-	    den = sinhrx * sinhrx + cosix * cosix;
-	  else
-	    den = cosix * cosix;
-	  __real__ res = sinhrx * (coshrx / den);
-	  __imag__ res = sinix * (cosix / den);
-	}
-      /* __gcc_qmul does not respect -0.0 so we need the following fixup.  */
-      if ((__real__ res == 0.0L) && (__real__ x == 0.0L))
-        __real__ res = __real__ x;
-
-      if ((__real__ res == 0.0L) && (__imag__ x == 0.0L))
-        __imag__ res = __imag__ x;
-    }
-
-  return res;
-}
-long_double_symbol (libm, __ctanhl, ctanhl);
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c b/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c
deleted file mode 100644
index fc44378..0000000
--- a/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/* Complex tangent function for long double.  IBM extended format version.
-   Copyright (C) 1997-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <complex.h>
-#include <fenv.h>
-#include <math.h>
-#include <math_ldbl_opt.h>
-#include <float.h>
-
-#include <math_private.h>
-
-/* IBM long double GCC builtin sets LDBL_EPSILON == LDBL_DENORM_MIN  */
-static const long double ldbl_eps = 0x1p-106L;
-
-__complex__ long double
-__ctanl (__complex__ long double x)
-{
-  __complex__ long double res;
-
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
-    {
-      if (isinf (__imag__ x))
-	{
-	  __real__ res = __copysignl (0.0, __real__ x);
-	  __imag__ res = __copysignl (1.0, __imag__ x);
-	}
-      else if (__real__ x == 0.0)
-	{
-	  res = x;
-	}
-      else
-	{
-	  __real__ res = __nanl ("");
-	  __imag__ res = __nanl ("");
-
-	  if (__isinf_nsl (__real__ x))
-	    feraiseexcept (FE_INVALID);
-	}
-    }
-  else
-    {
-      long double sinrx, cosrx;
-      long double den;
-      const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l / 2.0L);
-
-      /* tan(x+iy) = (sin(2x) + i*sinh(2y))/(cos(2x) + cosh(2y))
-        = (sin(x)*cos(x) + i*sinh(y)*cosh(y)/(cos(x)^2 + sinh(y)^2). */
-
-      __sincosl (__real__ x, &sinrx, &cosrx);
-
-      if (fabsl (__imag__ x) > t)
-	{
-	  /* Avoid intermediate overflow when the real part of the
-	    result may be subnormal.  Ignoring negligible terms, the
-	    imaginary part is +/- 1, the real part is
-	    sin(x)*cos(x)/sinh(y)^2 = 4*sin(x)*cos(x)/exp(2y).  */
-	  long double exp_2t = __ieee754_expl (2 * t);
-
-	  __imag__ res = __copysignl (1.0L, __imag__ x);
-	  __real__ res = 4 * sinrx * cosrx;
-	  __imag__ x = fabsl (__imag__ x);
-	  __imag__ x -= t;
-	  __real__ res /= exp_2t;
-	  if (__imag__ x > t)
-	    {
-	      /* Underflow (original imaginary part of x has absolute
-		 value > 2t).  */
-	      __real__ res /= exp_2t;
-	    }
-	  else
-	    __real__ res /= __ieee754_expl (2.0L * __imag__ x);
-	}
-      else
-	{
-	  long double sinhix, coshix;
-	  if (fabsl (__imag__ x) > LDBL_MIN)
-	    {
-	      sinhix = __ieee754_sinhl (__imag__ x);
-	      coshix = __ieee754_coshl (__imag__ x);
-	    }
-	  else
-	    {
-	      sinhix = __imag__ x;
-	      coshix = 1.0L;
-	    }
-
-	  if (fabsl (sinhix) > fabsl (cosrx) * ldbl_eps)
-	    den = cosrx * cosrx + sinhix * sinhix;
-	  else
-	    den = cosrx * cosrx;
-	  __real__ res = sinrx * (cosrx / den);
-	  __imag__ res = sinhix * (coshix / den);
-	}
-
-      /* __gcc_qmul does not respect -0.0 so we need the following fixup.  */
-      if ((__real__ res == 0.0L) && (__real__ x == 0.0L))
-        __real__ res = __real__ x;
-
-      if ((__real__ res == 0.0L) && (__imag__ x == 0.0L))
-        __imag__ res = __imag__ x;
-    }
-
-  return res;
-}
-long_double_symbol (libm, __ctanl, ctanl);
