Fix the configure script to work when the math functions are built-in

diff --git a/configure.ac b/configure.ac
index 9dc739c15105228bf5bfd47efef9ee8af36f8fae..97835955dcf2ec841f6e14d1c36ec0a58f1a3078 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -27,15 +27,23 @@ LT_INIT
 # Find a C compiler
 AC_PROG_CC
 
+# Finding a function which may be built-in in GCC is known to fail when using
+# -Werror, so we will only add that option afterwards. For more information, see
+# the discussion at http://lists.gnu.org/archive/html/bug-autoconf/2010-01/msg00031.html
+
 # Pedantic errors please
-CFLAGS="$CFLAGS -Wall -Werror -ansi -pedantic"
+CFLAGS="$CFLAGS -Wall -ansi -pedantic"
 
 # Find the standard math functions
 # Taken from http://www.flameeyes.eu/autotools-mythbuster/autoconf/finding.html
+AC_CHECK_HEADERS([math.h])
 AC_SEARCH_LIBS([log10], [m], [], [
   AC_MSG_ERROR([unable to find the log10() function])
 ])
 
+# Warnings as errors please
+CFLAGS="$CFLAGS -Werror"
+
 # Find GLib support via pkg-config
 PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.28])