diff -urN /usr/ports/audio/amp/Makefile audio/amp/Makefile
--- /usr/ports/audio/amp/Makefile	2014-03-01 06:21:19.000000000 +0900
+++ audio/amp/Makefile	2014-03-20 00:00:00.000000000 +0900
@@ -10,14 +10,20 @@
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Another mp3 player
 
-GNU_CONFIGURE=	yes
 USES=		gmake
+GNU_CONFIGURE=	yes
+CONFIGURE_ENV=	ac_cv_prog_gcc=no
+
+PLIST_FILES=	bin/amp man/man1/amp.1.gz
 
-PLIST_FILES=	bin/amp \
-		man/man1/amp.1.gz
+post-patch:
+	@${REINPLACE_CMD} -e \
+		'/CC="gcc"/s|^|#| ; \
+		 /CFLAGS=$$/s|^|#| ; \
+		 s|-O6|$$CFLAGS|' ${WRKSRC}/configure
 
 do-install:
-	${INSTALL_PROGRAM} ${WRKSRC}/amp ${STAGEDIR}${PREFIX}/bin
-	${INSTALL_MAN} ${WRKSRC}/amp.1 ${STAGEDIR}${PREFIX}/man/man1
+	(cd ${WRKSRC} && ${INSTALL_PROGRAM} amp ${STAGEDIR}${PREFIX}/bin)
+	(cd ${WRKSRC} && ${INSTALL_MAN} amp.1 ${STAGEDIR}${PREFIX}/man/man1)
 
 .include <bsd.port.mk>