Experimenting with installing git_deploy, I used drush to deploy libraries and then git_deploy. When I enabled git_deploy, the glip library was cloned into sites/all/libraries/glip/glip (so sites/all/libraries/glip/glip/README, for example). The library wasn't found at admin/reports/status, so I moved the library into sites/all/libraries/glip (so sites/all/libraries/glip/README)