these 2 derivations will be built:
  /nix/store/5f7xl42bgc2dn9ji02k70a37229dz3fr-nix-bindings-bdwgc-sys-deps-0.2.1.drv
  /nix/store/0zygyyydicyygja2vyxg9y4b8x4kgrr8-nix-bindings-bdwgc-sys-0.2.1.drv