diff --git a/math/py-dionysus/Makefile b/math/py-dionysus/Makefile
index ae884f939382..183493010c9e 100644
--- a/math/py-dionysus/Makefile
+++ b/math/py-dionysus/Makefile
@@ -1,30 +1,34 @@
 PORTNAME=	dionysus
 PORTVERSION=	2.0.10
 CATEGORIES=	math
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 PKGNAMESUFFIX=	-topology-library
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Library for computing persistent homology
 WWW=		https://mrzv.org/software/dionysus2/
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 BUILD_DEPENDS=	${LOCALBASE}/include/boost/range/adaptors.hpp:devel/boost-libs
 
-USES=		cmake python
+USES=		cmake compiler:c++14-lang python
+USE_PYTHON=	flavors pytest # 1 test fails, see https://github.com/mrzv/dionysus/issues/64, another one loops forever
 
 CMAKE_ARGS=	-DPython_EXECUTABLE:STRING=${PYTHON_CMD}
 CMAKE_OFF=	build_examples
 
+TEST_WRKSRC=	${WRKSRC}/tests
+TEST_ENV=	${MAKE_ENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
+
 PLIST_FILES=	${PYTHON_SITELIBDIR}/dionysus/__init__.py \
 		${PYTHON_SITELIBDIR}/dionysus/_dionysus${PYTHON_EXT_SUFFIX}.so \
 		${PYTHON_SITELIBDIR}/dionysus/_version.py \
 		${PYTHON_SITELIBDIR}/dionysus/plot.py
 
 do-install:
 	cd ${BUILD_WRKSRC}/bindings/python && ${COPYTREE_SHARE} ${PORTNAME} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 
 .include <bsd.port.mk>
diff --git a/math/py-dionysus/files/patch-bindings_python_boundary.cpp b/math/py-dionysus/files/patch-bindings_python_boundary.cpp
new file mode 100644
index 000000000000..f15f7504aa8e
--- /dev/null
+++ b/math/py-dionysus/files/patch-bindings_python_boundary.cpp
@@ -0,0 +1,13 @@
+- workaround for https://github.com/mrzv/dionysus/issues/63
+
+--- bindings/python/boundary.cpp.orig	2024-04-12 03:21:33 UTC
++++ bindings/python/boundary.cpp
+@@ -68,7 +68,7 @@ PyMatrixFiltration coboundary(const PyFiltration& f)
+                           return Entry(ee, f.index(e.index()));
+                         }))
+         {
+-            m.column(n - 1 - x.index()).emplace_back(Entry { x.element(), n - 1 - i });
++            m.column(n - 1 - x.index()).emplace_back(Entry { x.element(), (unsigned int)(n - 1 - i) });
+         }
+         ++i;
+     }