Don't pass -ffast-math to clang, since it ignores it and complains.
diff --git a/configure.ac b/configure.ac
index cf2e200..77004cc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -137,7 +137,10 @@
dnl Add flags for gcc and g++
if test "x$GCC" = xyes; then
- CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -std=c99 -ffast-math"
+ CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -std=c99"
+ if test "x$CLANG" = "xno"; then
+ CFLAGS="$CFLAGS -ffast-math"
+ fi
# Enable -fvisibility=hidden if using a gcc that supports it
save_CFLAGS="$CFLAGS"