these 2 derivations will be built:
  /nix/store/ws30dysr6wyczi94m9ikh87pnw64pwh4-nix-bindings-bdwgc-sys-deps-0.2.1.drv
  /nix/store/ikm4nvfwhg1rcsf1bnd8f0g18q1g4106-nix-bindings-bdwgc-sys-0.2.1.drv