COPYING.txt not installed by setup.py on POSIX
Created originally on Bitbucket by Anonymous
This happened with Nix package manager.
It installs thg like this:
python setup.py install --prefix=$out
But this doesn't create $out/share/doc/tortoisehg/Copying.txt.gz
which should provide license. Adding lines
mkdir -p $out/share/doc/tortoisehg
cp COPYING.txt $out/share/doc/tortoisehg/Copying.txt.gz
to build instructions fixes the issue, but maybe that should be embedded to setup.py?