It follows the same grouping idea the MASTER_SITE* use.
PORTNAME= bar PORTVERSION= 1.0 USE_GITHUB= yes GH_ACCOUNT= foo GH_PROJECT= ${PORTNAME}-images:images
will end up doing:
$ make fetch-urlall-list MASTER_SITE_BACKUP= https://codeload.github.com/foo/bar/tar.gz/1.0?dummy=/foo-bar-1.0_GH0.tar.gz https://codeload.github.com/foo/bar-images/tar.gz/1.0?dummy=/foo-bar-images-1.0-1.0.tar.gz
The magic will generate variables:
- DISTNAME_group the name of the distfile for that group, if, for example, it needs to be put in EXTRACT_ONLY, or something.
- WRKSRC_group the directory the distfile for that group was extracted to, to move things around in after-extract.