Index: devel/py-installer/Makefile
===================================================================
--- devel/py-installer/Makefile
+++ devel/py-installer/Makefile
@@ -2,6 +2,7 @@
 
 PORTNAME=	installer
 PORTVERSION=	0.5.1
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -12,9 +13,26 @@
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		python:3.7+
-USE_PYTHON=	autoplist concurrent distutils
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}flit-core>0:devel/py-flit-core@${PY_FLAVOR}
+
+USES=		python
+USE_PYTHON=	allflavors concurrent flavors
 
 NO_ARCH=	yes
 
+do-build:
+	cd ${BUILD_WRKSRC} && ${PYTHON_CMD} -m flit_core.wheel
+
+do-install:
+	@(${MKDIR} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR})
+	${SETENV} PYTHONPATH=${BUILD_WRKSRC}/src ${PYTHON_CMD} -m installer \
+		-d ${STAGEDIR} --no-compile-bytecode \
+		${BUILD_WRKSRC}/dist/${PORTNAME}-${PORTVERSION}-*.whl
+
+post-install:
+	# autoplist
+	${SED} -e 's|^|${PYTHONPREFIX_SITELIBDIR:S;^${PREFIX}/;;}/|' -e 's|\,.*$$||' \
+		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/${PORTNAME}-${PORTVERSION}.dist-info/RECORD | \
+		${SORT} > ${TMPPLIST}
+
 .include <bsd.port.mk>