In changelog for version 1.14.0 we have many enhancements for mupdf-gl, but it not installed any more.
It is not being built, and I need to look why. Thank you for reporting.
A commit references this bug: Author: rigoletto Date: Sun Feb 24 18:39:44 UTC 2019 New revision: 493796 URL: https://svnweb.freebsd.org/changeset/ports/493796 Log: graphics/mupdf: fix mupdf-gl not being built. PR: 236002 Reported by: Oleh Hushchenkov <o.hushchenkov@gmail.com> Approved by: tcberner (mentor) Changes: head/graphics/mupdf/Makefile head/graphics/mupdf/files/patch-Makerules head/graphics/mupdf/files/patch-thirdparty_lcms2_src_cmsmd5.c head/graphics/mupdf/pkg-plist
Thanks!