anchor.diff:    plan9port = callPackage ../tools/system/plan9port { };
   
     platformioPackages = callPackage ../development/arduino/platformio { };
  -  platformio = platformioPackages.platformio-chrootenv.override {};
  +  platformio = platformioPackages.platformio-chrootenv;
   
     platinum-searcher = callPackage ../tools/text/platinum-searcher { };
   
  
positive.code: 
    kinetic-cpp-client = callPackage ../development/libraries/kinetic-cpp-client { };
  
    krb5Full = callPackage ../development/libraries/kerberos/krb5.nix {
      inherit (darwin) bootstrap_cmds;
    };
    libkrb5 = krb5Full.override {
      fetchurl = fetchurlBoot;
      type = "lib";
    };
  
negative.code:   # and with or without atlas as a dependency. The default `liblapack` is 3.4.1
    # with atlas. Atlas, when built with liblapack as a dependency, uses 3.5.0
    # without atlas. Etc.
    liblapack = callPackage ../development/libraries/science/math/liblapack {};
    liblapackWithAtlas = liblapack;
    liblapackWithoutAtlas = liblapack.override { atlas = null; };
    liblapack_3_5_0 = callPackage ../development/libraries/science/math/liblapack/3.5.0.nix {};
    liblapack_3_5_0WithAtlas = liblapack_3_5_0;
    liblapack_3_5_0WithoutAtlas = liblapack_3_5_0.override { atlas = null; };
  
    liblbfgs = callPackage ../development/libraries/science/math/liblbfgs { };
  
  