The gemspec has an unsatisfied runtime dependency on rrd-ffi [= 0.2.13].
A commit references this bug: Author: sunpoet Date: Sun Jul 30 13:23:00 UTC 2017 New revision: 446934 URL: https://svnweb.freebsd.org/changeset/ports/446934 Log: Fix gemspec for rubygem-rrd-ffi - Bump PORTREVISION for package change PR: 220686 Reported by: lifanov Submitted by: sunpoet (myself) Approved by: maintainer (timeout, 17 days) Changes: head/devel/rubygem-errand/Makefile head/devel/rubygem-errand/files/ head/devel/rubygem-errand/files/patch-gemspec