diff --git a/config/functions b/config/functions
index 4270094400..9069afccd4 100644
--- a/config/functions
+++ b/config/functions
@@ -165,9 +165,13 @@ do_autoreconf() {
 
 strip_lto() {
   # strip out LTO optimization from *FLAGS
-  CFLAGS=`echo $CFLAGS | sed -e "s|-flto||g"`
-  CXXFLAGS=`echo $CXXFLAGS | sed -e "s|-flto||g"`
-  LDFLAGS=`echo $LDFLAGS | sed -e "s|-flto||g"`
+  if [ -n "$GCC_OPTIM_LTO" ] ; then
+    CFLAGS=`echo $CFLAGS | sed -e "s|$GCC_OPTIM_LTO||g"`
+    CXXFLAGS=`echo $CXXFLAGS | sed -e "s|$GCC_OPTIM_LTO||g"`
+  fi
+  if [ -n "$LD_OPTIM_LTO" ] ; then
+    LDFLAGS=`echo $LDFLAGS | sed -e "s|$LD_OPTIM_LTO||g"`
+  fi
 }
 
 strip_gold() {