diff -ruN pecl-xhprof.orig/Makefile pecl-xhprof/Makefile
--- pecl-xhprof.orig/Makefile	2010-09-16 11:47:35.000000000 +0100
+++ pecl-xhprof/Makefile	2010-09-16 12:09:48.000000000 +0100
@@ -20,5 +20,12 @@
 USE_PHP=	yes
 USE_PHPIZE=	yes
 USE_PHPEXT=	yes
+ONLY_FOR_ARCHS=	i386 amd64
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} < 701000
+BROKEN=		Does not compile on FreeBSD < 7.1
+.endif
+
+.include <bsd.port.post.mk>