--- autoconf/extra.m4
+++ autoconf/extra.m4
@@ -524,7 +524,7 @@
 		CFLAGS_saved="${CFLAGS_saved} -O0 "
 	else
 		strip_binaries="yes"
-		CFLAGS_saved="${CFLAGS_saved} -O3 "
+		CFLAGS_saved="${CFLAGS_saved} "
 		GDB_FLAGS=""
                 CPPFLAGS_saved="${CPPFLAGS_saved} -D_FORTIFY_SOURCE=2"
 	fi