these 2 derivations will be built:
  /nix/store/vzy49jnxkvq2qgc1q9gm1faz94nnq9w5-pi-vim-0.14.2.tgz.drv
  /nix/store/a5h53qs311jrgcz9li91w2xrghn75g6b-pi-vim-0.14.2.drv