these 2 derivations will be built:
  /nix/store/dwi51z5vv6wzs20wbzyxdpyb38bgr3m4-pk2cmdv1.20LinuxMacSource.tar.gz.drv
  /nix/store/p13v763wg6y0z46j3nilgr6bv1b15fxc-pk2cmd-1.20.drv
these 2 paths will be fetched (12.6 KiB download, 86.6 KiB unpacked):
  /nix/store/r2idzyv0hgm3bp5ir6frykzcgn5f7cck-libusb-compat-0.1.7
  /nix/store/rld6ck3jxcdgw01r48vn0x36aihv4ys0-libusb-compat-0.1.7-dev