X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffabsl.m4;h=78b3d9b2eea84b77893d38311e8a29209971ca3e;hb=7ef6c64e210ac0979d7e8ac69bc5b5208c2405ab;hp=fa4825bb3618757c32cf4dbb8ed644590ed81f5c;hpb=653b905f9a93de7280216e1f58be6068fb21acf4;p=gnulib.git

diff --git a/m4/fabsl.m4 b/m4/fabsl.m4
index fa4825bb3..78b3d9b2e 100644
--- a/m4/fabsl.m4
+++ b/m4/fabsl.m4
@@ -1,5 +1,5 @@
-# fabsl.m4 serial 1
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# fabsl.m4 serial 2
+dnl Copyright (C) 2011-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_FABSL],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
 
+  dnl Persuade glibc <math.h> to declare fabsl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Determine FABSL_LIBM.
   gl_MATHFUNC([fabsl], [long double], [(long double)])
   if test $gl_cv_func_fabsl_no_libm = yes \