$ nix-env -f . -qa '*' --meta --xml --drv-path --show-trace error: while querying the derivation named ‘python2.7-rpkg-1.50’: attribute ‘gpl2plus’ missing, at .../pkgs/development/python-modules/rpkg/default.nix:24:15 Introduced by commit c29a721350 ("rpkg: 1.14 -> 1.50").
c29a721350