Nix-git problem

nix-build '<nixpkgs>' --check -A libmkv
building path(s) ‘/nix/store/j5cva0rn6lqp0d2x0y63m1zdl4crmxvf-libmkv’
exporting https://github.com/saintdev/libmkv.git (rev refs/tags/0.6.5.1) into /nix/store/j5cva0rn6lqp0d2x0y63m1zdl4crmxvf-libmkv
Initialized empty Git repository in /nix/store/j5cva0rn6lqp0d2x0y63m1zdl4crmxvf-libmkv/.git/
remote: Counting objects: 29, done.
remote: Compressing objects: 100% (28/28), done.
remote: Total 29 (delta 1), reused 17 (delta 0), pack-reused 0
From https://github.com/saintdev/libmkv
 * tag               0.6.5.1    -> FETCH_HEAD
fatal: unable to look up current user in the passwd file: no such user
fatal: unable to look up current user in the passwd file: no such user
Unable to checkout refs/tags/0.6.5.1 from https://github.com/saintdev/libmkv.git.
builder for ‘/nix/store/nhzscvn955pm4k6k0cznkc6nskkjs1r6-libmkv.drv’ failed with exit code 1
cannot build derivation ‘/nix/store/3r47j3d50j6xjn8l61y0kdi1b5lz0lix-libmkv-0.6.5.1p2.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/3r47j3d50j6xjn8l61y0kdi1b5lz0lix-libmkv-0.6.5.1p2.drv’ failed