Created attachment 195077 [details] csmith.patch Apparently there was x86 assembly there back in 2012: https://github.com/freebsd/freebsd-ports/commit/49c06e19f9a13d7690679ef7791344ff06963fdf The current version builds and works fine on aarch64.
ping
A commit references this bug: Author: linimon Date: Tue Oct 23 06:36:00 UTC 2018 New revision: 482810 URL: https://svnweb.freebsd.org/changeset/ports/482810 Log: Enable build on all archs. Apparently the x86-specific code is long gone. PR: 229725 Submitted by: Greg V <greg at unrelenting.technology> Approved by: maintainer timeout (> 3 months) Changes: head/devel/csmith/Makefile