these 2 derivations will be built:
  /nix/store/dr00d4pny73fk4s2pjsqw795jngphrmw-atlassian-crowd-5.0.1.tar.gz.drv
  /nix/store/c9v9dy5n4j6wmywy1a9qqfzixdyhysm4-atlassian-crowd-5.0.1.drv