diff --git a/math/py-fastcluster/Makefile b/math/py-fastcluster/Makefile
index 4171f07b9e1c..345bb163e182 100644
--- a/math/py-fastcluster/Makefile
+++ b/math/py-fastcluster/Makefile
@@ -1,23 +1,32 @@
 PORTNAME=	fastcluster
 PORTVERSION=	1.2.6
 CATEGORIES=	math python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Fast hierarchical clustering routines for R and Python
 WWW=		http://danifold.net/fastcluster.html
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING.txt
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=0,1:math/py-numpy@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=1.9,1:math/py-numpy@${PY_FLAVOR}
 
-USES=		python:3.7+
+USES=		compiler python:3.7+
 USE_PYTHON=	autoplist concurrent distutils
 
+.include <bsd.port.pre.mk>
+
+.if ${ARCH:Mpowerpc*} && ${COMPILER_VERSION} == 140
+BUILD_DEPENDS+=	clang15:devel/llvm15
+CPP=            clang-cpp15
+CC=             clang15
+CXX=            clang++15
+.endif
+
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>