https://github.com/mpruett/audiofile/commit/edb0f83dbf35338788a26e26ef9f17f42b51d6fc

--- configure.orig	Tue Mar 12 17:10:16 2013
+++ configure	Tue Mar 12 17:10:37 2013
@@ -16504,7 +16504,7 @@ else
 $as_echo "yes" >&6; }
 	ac_cv_flac=yes
 fi
-		FLAC_CFLAGS=`echo $FLAC_CFLAGS | $SED "s/FLAC$//"`
+		FLAC_CFLAGS=`echo $FLAC_CFLAGS | $SED "s:include/FLAC:include:"`
 		if test "$ac_cv_flac" = "no" ; then
 			enable_flac=no
 		fi