diff --git a/cad/py-amaranth/Makefile b/cad/py-amaranth/Makefile
index e8f694c65e8d..e6379b6192eb 100644
--- a/cad/py-amaranth/Makefile
+++ b/cad/py-amaranth/Makefile
@@ -1,55 +1,51 @@
 PORTNAME=	amaranth
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.4.0
 CATEGORIES=	cad python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Amaranth hardware definition language
 WWW=		https://amaranth-lang.org/docs/amaranth/latest/
 
 LICENSE=	BSD3CLAUSE
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pdm-backend>0:devel/py-pdm-backend@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}Jinja2>=3.0:devel/py-Jinja2@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pyvcd>0:cad/py-pyvcd@${PY_FLAVOR}
 TEST_DEPENDS=	sby:cad/symbiyosys \
 		yosys:cad/yosys
 
 USES=		python
 USE_PYTHON=	pep517 autoplist pytest
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	amaranth-lang
 
 NO_ARCH=	yes
 
+MAKE_ENV=	PDM_BUILD_SCM_VERSION=${DISTVERSION} # this allows to build from a tarball (otherwise PDM wouldn't be able to determine the version)
 TEST_ENV=	${MAKE_ENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
 
-post-patch:
-	@${REINPLACE_CMD} \
-		-e 's|%%VERSION%%|${DISTVERSION}|' \
-		${WRKSRC}/pyproject.toml
-
 do-install: # workaround for https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272771
 	@${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:S/-/.post/}*.dist-info/RECORD >> ${_PYTHONPKGLIST}
 	@${REINPLACE_CMD} \
 		-e '/\.pyc$$/d' \
 		-e 's|^|${PYTHONPREFIX_SITELIBDIR}/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../etc/|etc/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../bin/|bin/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../include/|include/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../lib/|lib/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../libdata/|libdata/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../libexec/|libexec/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../man/|man/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../sbin/|sbin/|' \
 		-e 's|^${PYTHONPREFIX_SITELIBDIR}/../../../share/|share/|' \
 			${_PYTHONPKGLIST}
 	@cd ${STAGEDIR}${PREFIX} && ${FIND} lib -name '*.pyc' >> ${_PYTHONPKGLIST}
 
 .include <bsd.port.mk>
diff --git a/cad/py-amaranth/files/patch-pyproject.toml b/cad/py-amaranth/files/patch-pyproject.toml
deleted file mode 100644
index e19d759d8171..000000000000
--- a/cad/py-amaranth/files/patch-pyproject.toml
+++ /dev/null
@@ -1,17 +0,0 @@
---- pyproject.toml.orig	2023-12-13 09:29:50 UTC
-+++ pyproject.toml
-@@ -4,12 +4,13 @@ source = "scm"
- source = "scm"
- 
- [project]
--dynamic = ["version"]
-+dynamic = []
- 
- name = "amaranth"
- description = "Amaranth hardware definition language"
- authors = [{name = "Amaranth HDL contributors"}]
- license = {file = "LICENSE.txt"}
-+version = "%%VERSION%%"
- 
- requires-python = "~=3.8"
- dependencies = [