Nice work.

Note that you can export BUILDER=stack and git-annex will build with a
known good dependency stack, which can be more reliable/cross platform
than using apt to install its build dependencies. That needs
https://docs.haskellstack.org/ installed. Also it currently needs
GIT_TEST_GIT_ANNEX_REVISION=master since I improved git-annex's
Makefile slightly.

-- 
see shy jo