diff -ruN lamprop.orig/Makefile lamprop/Makefile
--- lamprop.orig/Makefile	2014-08-05 22:48:13.000000000 +0200
+++ lamprop/Makefile	2014-08-10 14:08:25.000000000 +0200
@@ -13,9 +13,7 @@
 
 RUN_DEPENDS=	${PYNUMPY}
 
-USES=		zip
-USE_PYTHON=	yes
-PYTHON_VERSION=	python2.7
+USES=		zip python:2.7
 
 do-install:
 	cd ${WRKSRC} && ${MAKE} PREFIX=${STAGEDIR}${PREFIX} install