Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -11,14 +11,14 @@
 AC_PROG_INSTALL
 
 CFLAGS="$CFLAGS -Wall"
 
 AS_IF([test x"$GCC" = x"yes"], [
-	CFLAGS="$CFLAGS -Werror -pipe"
+	CFLAGS="$CFLAGS -Werror -pipe -std=c99 -pedantic"
 ])
 
 BUILDSYS_SHARED_LIB
 BUILDSYS_INIT
 BUILDSYS_TOUCH_DEPS
 
 AC_CONFIG_FILES(buildsys.mk)
 AC_OUTPUT