I am trying to update the port devel/git-town. This patch https://people.freebsd.org/~yuri/git-town.patch contains exact GH_TUPLE that modules2tuple suggested. But the build fails:
> can't load package: package stretchr: cannot find package "." in:
> *** Error code 1
Not a bug in ports-mgmt/modules2tuple.
Removal of GH_SUBDIR fixes the port.