Portlint check seems to be broken, endless loop

Dear all,

I saw a problem arising many weeks ago, but now I want to report it.
You can easily trigger it with:
poudriere testport -j 130amd64 www/gitlab-ce

You will see:

[00:00:33] Removing old packages
[00:00:33] Portlint check
WARN: Makefile: [296]: possible direct use of command "install" found. 
use ${INSTALL_foobar} instead.
WARN: Makefile: possible use of absolute pathname "/sample$$/".
WARN: Makefile: Setting PORTREVISION to 0 is not necessary.

and then it hangs in and endless loop.
Anyone an idea what could cause this?

Gruß
Matthias

-- 

"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the universe trying to
produce bigger and better idiots. So far, the universe is winning." --
Rich Cook