diff --git a/configure.ac b/configure.ac
index e4e4d63..0b18298 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,10 @@ AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE()
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES])
 
+CFLAGS="$CFLAGS"
+CXXFLAGS="$CXXFLAGS"
+LDFLAGS="$LDFLAGS"
+
 LT_INIT
 
 AM_PROG_CC_C_O