--- a/configure	Fri Feb 10 19:26:10 2012 +1000
+++ b/configure	Fri Feb 17 11:52:47 2012 +1000
@@ -9751,6 +9751,8 @@
 
 { echo "$as_me:$LINENO: checking support for fastcall calling conventions" >&5
 echo $ECHO_N "checking support for fastcall calling conventions... $ECHO_C" >&6; };
+save_CFLAGS="$CFLAGS"
+CFLAGS="-Werror $save_CFLAGS"
 if test "$cross_compiling" = yes; then
 
       { echo "$as_me:$LINENO: result: no" >&5
@@ -9817,6 +9819,7 @@
 fi
 
 
+CFLAGS="$save_CFLAGS"
 
 
 { echo "$as_me:$LINENO: checking support for force inlining" >&5