this derivation will be built:
  /nix/store/ygc4n3gridxwa8s5ll2bhmddnw1ha91v-Blackbird-2017-12-13.drv
these 8 paths will be fetched (2.2 MiB download, 17.9 MiB unpacked):
  /nix/store/dkp4pvar4xi7s7zi0wy1qwmjibnqz40w-autoconf-2.71
  /nix/store/imkgqkcy655gasinn2liv7n3k3hfqzzj-automake-1.16.5
  /nix/store/flz7zd718rmq03jnxv86767i5pzhwrs8-file-5.43
  /nix/store/hslazf38vmbb066c0d72kdgxnyvgfl5f-gnum4-1.4.19
  /nix/store/hfp6q01kfdbkvvcdwpb76xim7zdr5gmm-gtk-engine-murrine-0.98.2
  /nix/store/b0zsdilmc1lj77l0yg4pispp83p0da7r-hook
  /nix/store/1mcdcmz3rd8dal1vc7wky21nnsswmpai-libtool-2.4.7
  /nix/store/5cpkimy49vdfx8ldlhgsclxbbgdignmc-source