Subject: Do not set unwanted CFLAGS, as it breaks DEB_BUILD_OPTIONS
From: Santiago Vila <[email-masked]>

--- a/unix/configure
+++ b/unix/configure
@@ -98,7 +98,7 @@ int main()
 _EOF_
       $CC $CFLAGS -c conftest.c > /dev/null 2>/dev/null
       if test $? -eq 0; then
-        CFLAGS_OPT='-O3'
+        # CFLAGS_OPT='-O3'
         echo "  GNU C ($CFLAGS_OPT)"
         # Special Mac OS X shared library "ld" option?
         if test ` uname -s 2> /dev/null ` = 'Darwin'; then