This is for VEGAS@Greenbank. It has mlib_devel as a git submodule. After cloning this repository, the mlib_devel subdirectoy will be empty until the mlib_devel submodule is initialized. You can do this by running:
$ git submodule update --initWhenever you pull/merge a new version of this repository, you should verify whether the mlib_devel version has changed and, if so, update it. Since updating an already up-to-date submodule is essentially a no-op, you just need to follow the pull/merge command with a submodeul update command:
$ git submodule update