Created attachment 216428 [details] box2d.diff Upstream rerolled the distfile, I happen to have the old one and checked the only difference is the top level directory has been renamed from Box2D-2.3.1 to box2d-2.3.1 I'm not sure if a MOVED entry is needed since the port entry "misc/box2d" is not changed, but the package has been renamed from Box2D-2.3.1 to box2d-2.3.1.
Build info is available at https://gitlab.com/swills/freebsd-ports/pipelines/171854798
A commit references this bug: Author: yuri Date: Wed Jul 29 00:40:16 UTC 2020 New revision: 543640 URL: https://svnweb.freebsd.org/changeset/ports/543640 Log: misc/box2d: Update the port because the repository was renamed PR: 247962 Submitted by: lwhsu (original version) Changes: head/misc/box2d/Makefile head/misc/box2d/distinfo
Committed a similar patch. They renamed the repository to lowercase. portmgr@ previously expressed his opinion to not change PORTNAME's case, so leaving it. Thanks for the patch!