anchor.diff:  
         mkdir api && scaladoc \
           -doc-title ScalaCheck \
  -        -doc-version "${scalacheck.version}" \
  -        -doc-footer "${docFooter scalacheck.version scalacheck.rev}" \
  -        -doc-source-url "${docSourceUrl scalacheck.version scalacheck.rev}" \
  +        -doc-version "${scVer}" \
  +        -doc-footer "${docFooter scVer sc.rev}" \
  +        -doc-source-url "${docSourceUrl scVer sc.rev}" \
           -classpath "$testinterface" \
           -sourcepath src/main/scala \
           -d api \
  
positive.code: { stdenv, fetchurl, fetchgit, openjdk, glibcLocales, lib }:
  
  with lib;
  
  let
    scalacheckRepoUrl = "https://github.com/rickynils/scalacheck";
  
negative.code:     '';
    };
  
    scalaVersions = {
      "2.9.1-1" = {
        version = "2.9.1-1";
        sha256 = "0b5lhfy33ng6q4rjz11j89k694h5x12ms9qdnv0ym3jav10r6qab";
      };
      "2.9.2" = {
        version = "2.9.2";
        sha256 = "0s1shpzw2hyz7bwxdqq19rcrzbpq4d7b0kvdvjvhy7h05x496b46";
      };
      "2.9.3" = {
        version = "2.9.3";
        sha256 = "1fg7qizxhgw6957plv99jh8p6z3rpi2w0cgxx1im154cywlv5aps";
      };
      "2.10.1" = {
        version = "2.10.1";
        sha256 = "0krzm6ln4ldy6wvk7mw93vnjsjf8pkylccnwz08hzj7wnvspgijk";
      };
      "2.10.2" = {
        version = "2.10.2";
        sha256 = "18v6jr42rif84q5cb82kynigqls2q5q3qnb61040m92496ygv4zn";
      };
      "2.10.3" = {
        version = "2.10.3";
        sha256 = "16ac935wydrxrvijv4ldnz4vl2xk8yb3yzb9bsi3nb9sic7fxl95";
      };
      "2.10" = scalaVersions."2.10.3";
      "2.11.0-M5" = {
        version = "2.11.0-M5";
        sha256 = "1zj89i0n3p4rrcj70hfi821qpc1qrzqjlivrb0iargvagrqq2ih2";
      };
    };
  
    scalacheckVersions = {
      "1.10.1" = {
        rev = "ecb39d126f919795738e3b0bb66dc088e31ccef3";
        sha256 = "1yjvh1r2fp46wdmsajmljryp03qw92albjh07vvgd15qw3v6vz3k";
        inherit scalaVersions;
      };
      "1.10.0" = {
        rev = "2338afc425a905fdc55b4fd67bd8bfc3358e3390";
        sha256 = "0a3kgdqpr421k624qhpan3krjdhii9fm4zna7fbbz3sk30gbcsnj";
        inherit scalaVersions;
      };
      "1.9" = {
        rev = "ddfd03e49b05fba702539a4aff03e60ea35a57e0";
        sha256 = "1dbxp9w7pjw1zf50x3hz6kwzm8xp3hvdbswnxsrcswagvqmc5kkm";
        runTests = false;
        inherit scalaVersions;
      };
      "1.8" = {
        rev = "f2175ed5ac20f37c1a7ec320b1c58de7a8e3c27f";
        sha256 = "0gkwnqw9wcv0p0dbc6w0i54zw9lb32qnl8qdsp3mn6ylkwj5zx0h";
        inherit scalaVersions;
      };
    };
  
  }
  