--- configure
+++ configure
@@ -20547,8 +20547,7 @@
 	CFLAGS="-g $CFLAGS"
 else
 	CPPFLAGS="-DNDEBUG $CPPFLAGS"
-	CFLAGS=$(echo "$CFLAGS" | sed 's/-O2//')
-	CFLAGS="-O3 -funroll-loops $CFLAGS"
+	CFLAGS="$CFLAGS"
 fi