Index: head/devel/py-libzfs/Makefile
===================================================================
--- head/devel/py-libzfs/Makefile
+++ head/devel/py-libzfs/Makefile
@@ -27,8 +27,8 @@
 USES=		python
 USE_PYTHON=	autoplist distutils cython
 
-CONFIGURE_ENV=	FREEBSD_SRC=${SRC_BASE}
-MAKE_ENV=	FREEBSD_SRC=${SRC_BASE}
+CONFIGURE_ENV=	freebsd_src=${SRC_BASE}
+MAKE_ENV=	freebsd_src=${SRC_BASE}
 
 .include <bsd.port.options.mk>