--- configure.orig	2018-01-09 02:02:01 UTC
+++ configure
@@ -16355,8 +16355,8 @@ $as_echo "yes" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-      AM_CFLAGS=-O3
-      AM_CXXFLAGS=-O3
+      AM_CFLAGS=
+      AM_CXXFLAGS=
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
   CXXFLAGS="$my_save_cxxflags"