--- 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.
 
--- nxcompext/configure.in.orig	2008-12-18 15:55:29.000000000 +0100
+++ nxcompext/configure.in	2008-12-18 15:55:51.000000000 +0100
@@ -5,11 +5,6 @@
 AC_INIT(NXlib.h)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="-O3"
-CFLAGS="-O3"
-
 dnl Reset default linking directives.
 
 LIBSTATIC=""
--- nxcompshad/configure.in.orig	2008-12-18 15:56:13.000000000 +0100
+++ nxcompshad/configure.in	2008-12-18 15:56:22.000000000 +0100
@@ -5,11 +5,6 @@
 AC_INIT(Shadow.h)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="-O3"
-CPPFLAGS="-O3"
-
 dnl Reset default linking directives.
 
 LIBSTATIC=""
--- nxproxy/configure.in.orig	2008-12-18 15:57:48.000000000 +0100
+++ nxproxy/configure.in	2008-12-18 15:57:55.000000000 +0100
@@ -5,11 +5,6 @@
 AC_INIT(Main.c)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="-O3"
-CPPFLAGS="-O3"
-
 dnl Prefer headers and libraries from nx-X11 if present.
 
 if test -d "../nx-X11/exports/include" ; then