--- nxcomp/configure.in.orig	2008-12-18 15:48:09.000000000 +0100
+++ nxcomp/configure.in	2008-12-18 15:54:14.000000000 +0100
@@ -7,8 +7,7 @@
 
 dnl Set our default compilation flags.
 
-CXXFLAGS="-O3 -fno-rtti -fno-exceptions"
-CFLAGS="-O3"
+CXXFLAGS="$CXXFLAGS -fno-rtti -fno-exceptions"
 
 dnl Reset default linking directives.