Looks like its happy now. I had to make some more changes to the Makefile to compile the new version.
PORTNAME= plexmediaserver
PORTVERSION?= 1.15.0.659
DISTVERSIONSUFFIX?=9311f93fd
CATEGORIES= multimedia
MASTER_SITES= https://downloads.plex.tv/plex-media-server-new/${DISTVERSION}-${DISTVERSIONSUFFIX}/freebsd/
DISTNAME= PlexMediaServer-${DISTVERSION}-${DISTVERSIONSUFFIX}-FreeBSD-${ARCH}
Thanks for the help.