these 2 derivations will be built:
  /nix/store/mgl11pzbdnhz69a7sqyk4ni9sykjnmb5-jscpd-5.1.1-vendor.drv
  /nix/store/1shiry07bic9nc2fb15qzq14mwc995rh-jscpd-5.1.1.drv