Index: head/devel/Makefile
===================================================================
--- head/devel/Makefile
+++ head/devel/Makefile
@@ -4482,6 +4482,7 @@
     SUBDIR += py-gyp
     SUBDIR += py-hash_ring
     SUBDIR += py-heapdict
+    SUBDIR += py-hg-evolve
     SUBDIR += py-hglib
     SUBDIR += py-hgtools
     SUBDIR += py-holidays
Index: head/devel/py-hg-evolve/Makefile
===================================================================
--- head/devel/py-hg-evolve/Makefile
+++ head/devel/py-hg-evolve/Makefile
@@ -0,0 +1,24 @@
+# $FreeBSD$
+
+PORTNAME=	hg-evolve
+PORTVERSION=	10.1.0
+CATEGORIES=	devel python
+MASTER_SITES=	CHEESESHOP
+PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
+
+MAINTAINER=	rhurlin@FreeBSD.org
+COMMENT=	Changeset Evolution with Mercurial
+
+LICENSE=	GPLv2+
+
+RUN_DEPENDS=	hg:devel/mercurial
+
+USES=		python:3.6+
+USE_PYTHON=	autoplist distutils
+
+NO_ARCH=	yes
+
+# Do not conflict with devel/mercurial, which also installs hgext3rd/__init__.py
+EXTRACT_AFTER_ARGS=	--exclude ${DISTNAME}/hgext3rd/__init__.py
+
+.include <bsd.port.mk>
Index: head/devel/py-hg-evolve/distinfo
===================================================================
--- head/devel/py-hg-evolve/distinfo
+++ head/devel/py-hg-evolve/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1604941749
+SHA256 (hg-evolve-10.1.0.tar.gz) = a386e6ee2d9a0e332a49f1cb210c4c11ba9844bcd52808270f48e688314783d8
+SIZE (hg-evolve-10.1.0.tar.gz) = 836446
Index: head/devel/py-hg-evolve/pkg-descr
===================================================================
--- head/devel/py-hg-evolve/pkg-descr
+++ head/devel/py-hg-evolve/pkg-descr
@@ -0,0 +1,14 @@
+evolve is a Mercurial extension for faster and safer mutable history. It
+implements the changeset evolution concept for Mercurial.
+
+- It offers a safe and simple way to refine changesets locally and
+  propagate those changes to other repositories.
+- It can automatically detect and handle the complex issues that can
+  arise from exchanging draft changesets.
+- It even makes it possible for multiple developers to safely rewrite
+  the same parts of history in a distributed way.
+- It fully respects the Phases concept so users will only be able to
+  rewrite parts of the history that are safe to change. Phases have been
+  part of Mercurial since early 2012.
+
+WWW: https://www.mercurial-scm.org/doc/evolution/