```
$ nix-shell -p crispyDoom                             
these paths will be fetched (1.06 MiB download, 4.42 MiB unpacked):
  /nix/store/4jbi6z5nvd4lq2mbz048lqr2s6ylll4m-SDL2_net-2.0.1
  /nix/store/aqfb83b19jzq4jiwkxphl4w0p7s59fid-smpeg2-svn412
  /nix/store/ghdhfxljmmhaiw84a8aydl882k3czfk7-SDL2_mixer-2.0.4
  /nix/store/mghf6qxda9c6805yxjdw59ikplf2xh63-flac-1.3.3-dev
  /nix/store/xqij3xinhl9cdha4nqcnh3qlpxivnh3j-crispy-doom-5.8.0
  /nix/store/y5a8g5c83byi83bvr922zx6wywrszipv-flac-1.3.3-bin
copying path '/nix/store/4jbi6z5nvd4lq2mbz048lqr2s6ylll4m-SDL2_net-2.0.1' from 'https://cache.nixos.org'...
copying path '/nix/store/aqfb83b19jzq4jiwkxphl4w0p7s59fid-smpeg2-svn412' from 'https://cache.nixos.org'...
copying path '/nix/store/y5a8g5c83byi83bvr922zx6wywrszipv-flac-1.3.3-bin' from 'https://cache.nixos.org'...
copying path '/nix/store/mghf6qxda9c6805yxjdw59ikplf2xh63-flac-1.3.3-dev' from 'https://cache.nixos.org'...
copying path '/nix/store/ghdhfxljmmhaiw84a8aydl882k3czfk7-SDL2_mixer-2.0.4' from 'https://cache.nixos.org'...
copying path '/nix/store/xqij3xinhl9cdha4nqcnh3qlpxivnh3j-crispy-doom-5.8.0' from 'https://cache.nixos.org'...

[nix-shell:~]$ crispy-doom
                           Crispy Doom 5.8.0
Z_Init: Init zone memory allocation daemon. 
```