X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fpowf.m4;h=6f8c66d70631be655c312ccd0f7f518c03696a25;hb=618fd97d05ba9f1411536c887dbeebe3807c055a;hp=947573ebe498ec6820d6df70f1dc51ad63fc7963;hpb=b398592c340a33c50703310c3df0d50ed777fe0d;p=gnulib.git

diff --git a/m4/powf.m4 b/m4/powf.m4
index 947573ebe..6f8c66d70 100644
--- a/m4/powf.m4
+++ b/m4/powf.m4
@@ -1,5 +1,5 @@
-# powf.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# powf.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,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_POWF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_POW])
 
+  dnl Persuade glibc <math.h> to declare powf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether powf() exists. Assume that powf(), if it exists, is
   dnl defined in the same library as pow().
   save_LIBS="$LIBS"