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The -fforce-mem option has been removed in gcc 4.3
http://gcc.gnu.org/gcc-4.3/changes.html

--- libmad-0.15.1b/configure.orig	2010-03-05 10:57:19.522398811 +0100
+++ libmad-0.15.1b/configure	2010-03-05 10:58:45.278933253 +0100
@@ -19099,7 +19099,6 @@
     case "$optimize" in
 	-O|"-O "*)
 	    optimize="-O"
-	    optimize="$optimize -fforce-mem"
 	    optimize="$optimize -fforce-addr"
 	    : #x optimize="$optimize -finline-functions"
 	    : #- optimize="$optimize -fstrength-reduce"