Created attachment 161841 [details] log of poudriere bulk -F Distfile couldn't be fetched from all SF mirrors. But fetching is succeeded by MASTER_SITE_BACKUP. It is a problem of MASTER_SITE_SUBDIR. MASTER_SITE_SUBDIR should be set to potrace/${PORTVERSION} or MASTER_SITES should be changed to SF/potrace/${PORTVERSION} to solve it.
A commit references this bug: Author: hrs Date: Thu Oct 22 02:23:06 UTC 2015 New revision: 399944 URL: https://svnweb.freebsd.org/changeset/ports/399944 Log: - Update to 1.12. - Fix MASTER_SITES [*]. Spotted by: Tatsuki Makino [*] PR: 203652 [*] Changes: head/graphics/libpotrace/Makefile head/graphics/libpotrace/distinfo
Thank you for your report. Fixed now.