X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fsinf.m4;h=bde7d633f698e5ffc1aeb09de600cb7d3c567ef7;hb=62dbbbd1dd25b29720a66a2a2a9c6cec0f7bac10;hp=612da994a2607191ac634220099fdcad299f3509;hpb=1602f0afed21be664fcf5c42d59db07cc22c56d6;p=gnulib.git

diff --git a/m4/sinf.m4 b/m4/sinf.m4
index 612da994a..bde7d633f 100644
--- a/m4/sinf.m4
+++ b/m4/sinf.m4
@@ -1,4 +1,4 @@
-# sinf.m4 serial 1
+# sinf.m4 serial 2
 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_SINF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_SIN])
 
+  dnl Persuade glibc <math.h> to declare sinf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether sinf() exists. Assume that sinf(), if it exists, is
   dnl defined in the same library as sin().
   save_LIBS="$LIBS"