let {
mkDrv = text: inputs: derivation {
name = "parallel";
system = "@system@";
builder = "@shell@";
args = ["-e" "-x" ./parallel.builder.sh];
shared = "@extra1@";
inherit text inputs;
};
a = mkDrv "a" [];
b = mkDrv "b" [a];
c = mkDrv "c" [a];
d = mkDrv "d" [a];
e = mkDrv "e" [b c d];
body = e;
}