diff --git a/cad/verilator/Makefile b/cad/verilator/Makefile
index 99f30d42f600..d00ef47395dc 100644
--- a/cad/verilator/Makefile
+++ b/cad/verilator/Makefile
@@ -1,65 +1,68 @@
 PORTNAME=	verilator
 DISTVERSIONPREFIX=	v
 DISTVERSION=	5.006
+PORTREVISION=	1
 CATEGORIES=	cad
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Synthesizable Verilog to C++ compiler
 WWW=		https://www.veripool.org/projects/verilator/wiki/Intro
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BROKEN_i386=	see https://github.com/verilator/verilator/issues/3037
 
 BUILD_DEPENDS=	autoconf>0:devel/autoconf \
 		bash:shells/bash \
 		${LOCALBASE}/bin/ar:devel/binutils \
 		help2man:misc/help2man
 LIB_DEPENDS=	libsystemc.so:devel/systemc
 RUN_DEPENDS=	gmake:devel/gmake # verilator runs gmake for the --hierarchical option when the 'gmake' method is chosen
 
 USES=		bison compiler:c++14-lang gmake localbase:ldflags pathfix perl5 python:build,run,test shebangfix tar:tgz
 USE_GITHUB=	yes
 
 SHEBANG_FILES=	bin/verilator_ccache_report \
 		bin/verilator_difftree \
 		bin/verilator_gantt \
 		bin/verilator_includer \
 		bin/verilator_includer \
 		bin/verilator_profcfunc
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ENV=	INSTALL_PROGRAM="${INSTALL_SCRIPT}"
 CONFIGURE_ARGS=	AR=${LOCALBASE}/bin/ar
 CONFIGURE_SHELL=	${LOCALBASE}/bin/bash # see https://github.com/verilator/verilator/issues/3132
 
 TEST_TARGET=	test
 
 BINARY_ALIAS=	make=${GMAKE} python3=${PYTHON_CMD} # aliasas are only for tests
 
 OPTIONS_DEFINE=			INSTALL_DBG_EXECUTABLES LEAK_CHECKS
 OPTIONS_SUB=			yes
 
 INSTALL_DBG_EXECUTABLES_DESC=	Install *_dbg executables
 
 LEAK_CHECKS_DESC=		Disable intentional memory leaks
 LEAK_CHECKS_CXXFLAGS=		-DVL_LEAK_CHECKS
 LEAK_CHECKS_BROKEN=		compilation will be fixed in the next release
 
 post-patch:
-	${REINPLACE_CMD} -e 's|@pkgconfigdir@|${PREFIX}/libdata/pkgconfig|' \
-	    ${WRKSRC}/Makefile.in
+	@${REINPLACE_CMD} -e 's|AC_PATH_PROG(PYTHON3,python3)|AC_PATH_PROG(PYTHON3,${PYTHON_VERSION})|' \
+		${WRKSRC}/configure.ac # hack-workaround for https://github.com/verilator/verilator/issues/3970
+	@${REINPLACE_CMD} -e 's|@pkgconfigdir@|${PREFIX}/libdata/pkgconfig|' \
+		${WRKSRC}/Makefile.in
 
 pre-configure:
 	cd ${WRKSRC} && \
 		autoconf
 
 post-build:
 	@${STRIP_CMD} ${WRKSRC}/bin/verilator_bin
 
 post-install-INSTALL_DBG_EXECUTABLES-off:
 	@${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/verilator_bin
 	@${RM} ${STAGEDIR}${PREFIX}/bin/verilator_bin_dbg ${STAGEDIR}${PREFIX}/bin/verilator_coverage_bin_dbg
 
 .include <bsd.port.mk>