Index: Mk/Uses/python.mk
===================================================================
--- Mk/Uses/python.mk
+++ Mk/Uses/python.mk
@@ -140,6 +140,9 @@
 #			  version number (used for dependencies).
 #			  default: ${PYTHONBASE}/bin/${PYTHON_VERSION}
 #
+# PEP517_PKGNAME	- Internal name in the Python pacakge.
+#			  default: ${PORTNAME}
+#
 # PEP517_BUILD_CMD	- Command sequence for a PEP-517 build frontend that builds a wheel.
 #			  default: ${PYTHON_CMD} -m build --no-isolation --wheel ${PEP517_BUILD_CONFIG_SETTING}
 #			  Python 3.7: gpep517-${PYTHON_VER} build-wheel --output-fd 1 --wheel-dir ${BUILD_WRKSRC}/dist
@@ -680,6 +683,7 @@
 PYDISTUTILS_EGGINFODIR?=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 
 # PEP-517 support
+PEP517_PKGNAME?=	${PORTNAME}
 .  if ${PYTHON_REL} < 30800
 PEP517_BUILD_CMD?=	gpep517-${PYTHON_VER} build-wheel --output-fd 1 --wheel-dir ${BUILD_WRKSRC}/dist
 PEP517_BUILD_DEPEND?=	${PYTHON_PKGNAMEPREFIX}gpep517>=0:devel/py-gpep517@${PY_FLAVOR}
@@ -687,7 +691,7 @@
 PEP517_BUILD_CMD?=	${PYTHON_CMD} -m build --no-isolation --wheel ${PEP517_BUILD_CONFIG_SETTING}
 PEP517_BUILD_DEPEND?=	${PYTHON_PKGNAMEPREFIX}build>=0:devel/py-build@${PY_FLAVOR}
 .  endif
-PEP517_INSTALL_CMD?=	${PYTHON_CMD} -m installer --destdir ${STAGEDIR} --prefix ${PREFIX} ${BUILD_WRKSRC}/dist/${PORTNAME:C|[-_]+|_|g}-${DISTVERSION}*.whl
+PEP517_INSTALL_CMD?=	${PYTHON_CMD} -m installer --destdir ${STAGEDIR} --prefix ${PREFIX} ${BUILD_WRKSRC}/dist/${PEP517_PKGNAME:C|[-_]+|_|g}-${DISTVERSION}*.whl
 PEP517_INSTALL_DEPEND?=	${PYTHON_PKGNAMEPREFIX}installer>=0:devel/py-installer@${PY_FLAVOR}
 
 # nose support
@@ -908,7 +912,7 @@
 	@${MKDIR} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 	@cd ${INSTALL_WRKSRC} && ${SETENV} ${MAKE_ENV} ${PEP517_INSTALL_CMD}
 	@${PYTHON_CMD} -B ${PORTSDIR}/Mk/Scripts/strip_RECORD.py \
-		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/${PORTNAME:C|[-_]+|_|g}-${DISTVERSION}*.dist-info/RECORD >> ${_PYTHONPKGLIST}
+		${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/${PEP517_PKGNAME:C|[-_]+|_|g}-${DISTVERSION}*.dist-info/RECORD >> ${_PYTHONPKGLIST}
 	@${REINPLACE_CMD} \
 		-e '/\.pyc$$/d' \
 		-e 's|^|${PYTHONPREFIX_SITELIBDIR}/|' \