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nixpkgs/pkgs/build-support/fetchegg/default.nix

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# Fetches a chicken egg from henrietta using `chicken-install -r'
# See: http://wiki.call-cc.org/chicken-projects/egg-index-4.html
{ stdenv, chicken }:
{ name, version, md5 ? "", sha256 ? "" }:
stdenv.mkDerivation {
name = "chicken-${name}-export";
builder = ./builder.sh;
buildInputs = [ chicken ];
outputHashAlgo = if sha256 == "" then "md5" else "sha256";
outputHashMode = "recursive";
outputHash = if sha256 == "" then md5 else sha256;
inherit version;
eggName = name;
impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
}