diff --git a/configure.ac b/configure.ac
index 3a24053bb..1b99702fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -55,8 +55,6 @@ if test "$sys_name" = sunos; then
 fi
 
 
-CFLAGS=
-CXXFLAGS=
 AC_PROG_CC
 AC_PROG_CXX