--- ../nxcomp/configure.in.orig	2011-06-21 15:06:20.000000000 +0200
+++ ../nxcomp/configure.in	2011-06-21 15:07:01.000000000 +0200
@@ -5,11 +5,6 @@
 AC_INIT(NX.h)
 AC_PREREQ(2.13)
 
-dnl Set our default compilation flags.
-
-CXXFLAGS="-O3 -fno-rtti -fno-exceptions"
-CFLAGS="-O3"
-
 dnl Reset default linking directives.
 
 LIBSTATIC=""
@@ -49,7 +44,7 @@
 dnl Check for programs.
 
 AC_PROG_CXX
-AC_PROG_CC
+AC_PROG_CC([clang gcc cc])
 AC_LANG_CPLUSPLUS
 
 dnl Check whether option -Wno-deprecated