anchor.diff: -{ stdenv, writeScriptBin, lib, fetchurl, fetchFromGitHub, git, cacert
  +{ stdenv, writeScriptBin, lib, fetchurl, git, cacert
   , erlang, openssl, expat, libyaml, bash, gnused, gnugrep, coreutils, utillinux, procps
   , withMysql ? false
   , withPgsql ? false
  
positive.code:   preBuild = ''
      cp -r $deps deps
      chmod -R +w deps
  
      for i in deps/*; do
        [ -x "$i/configure" ] && ( cd "$i"; ./configure ) || true
      done
    '';
  
    postInstall = ''
  
negative.code:           rm -rf .git
          )
        done
        rm deps/.got
  
        cp -r deps $out
      '';
  
      outputHashMode = "recursive";
      outputHashAlgo = "sha256";
      outputHash = "0zmb7g00y5q4alf70i1chv3yim63i03sy4p8i83bzvxri59vw0zv";
    };
  
    configureFlags =
  