In https://github.com/concord-consortium/lab/blob/master/Guardfile#L157 , the guardfile tries executing the command make test-src but the Makefile reveals that there is no such target test-src defined. Hence it abruptly breaks the guard command and also breaks the application.
Thus, command make works properly but guard does not. So, I suppose that test-src must be replaced by test in the guard file.
Suggestions?