diff -ruNp curl-7.19.4.orig/configure.ac curl-7.19.4/configure.ac
--- curl-7.19.4.orig/configure.ac	2009-02-13 15:25:15.000000000 +0100
+++ curl-7.19.4/configure.ac	2009-04-22 11:56:32.171305420 +0200
@@ -241,7 +241,10 @@ dnl ************************************
 
 CURL_CHECK_COMPILER
 CURL_SET_COMPILER_BASIC_OPTS
-CURL_SET_COMPILER_DEBUG_OPTS
+
+dnl do not perturb CFLAGS given by the build system
+dnl CURL_SET_COMPILER_DEBUG_OPTS
+
 CURL_SET_COMPILER_OPTIMIZE_OPTS
 CURL_SET_COMPILER_WARNING_OPTS