diff --git a/devel/py-meliae/Makefile b/devel/py-meliae/Makefile
index 44c8fd36a90a..5285f4391221 100644
--- a/devel/py-meliae/Makefile
+++ b/devel/py-meliae/Makefile
@@ -1,19 +1,28 @@
 PORTNAME=	meliae
 PORTVERSION=	0.5.1
 CATEGORIES=	devel python
 MASTER_SITES=	https://launchpadlibrarian.net/478629999/
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sbz@FreeBSD.org
 COMMENT=	Python Memory Usage Analyzer
 
 LICENSE=	GPLv3
 #LICENSE_FILE=	${WRKSRC}/COPYING.txt
 
+DEPRECATED=	does not build against Python-3.9
+# See https://bugs.launchpad.net/meliae/+bug/1899379
+
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}six>0:devel/py-six@${PY_FLAVOR}
 
 USES=		python:3.6-3.8
 USE_PYTHON=	distutils autoplist cython
 TEST_TARGET=	check  # test fails
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+.if ${PYTHON_VER} == 3.9
+BROKEN=	build error: PyGC_HEAD is private in Python 3.9
+.endif
+
+.include <bsd.port.post.mk>