anchor.diff:  
       setSourceRoot = ''sourceRoot="$(echo */kdiff3/)"'';
   
  +    patches = [
  +      (fetchpatch {
  +        name = "git-mergetool.diff"; # see https://gitlab.com/tfischer/kdiff3/merge_requests/2
  +        url = "https://gitlab.com/vcunat/kdiff3/commit/6106126216.patch";
  +        sha256 = "16xqc24y8bg8gzkdbwapiwi68rzqnkpz4hgn586mi01ngig2fd7y";
  +      })
  +    ];
  +    patchFlags = "-p 2";
  +
       postPatch = ''
         sed -re "s/(p\\[[^]]+] *== *)('([^']|\\\\')+')/\\1QChar(\\2)/g" -i src/diff.cpp
       '';
  
positive.code:     nativeBuildInputs = [ extra-cmake-modules kdoctools ];
  
      propagatedBuildInputs = [ kconfig kinit kparts ];
  
      meta = with lib; {
        homepage = http://kdiff3.sourceforge.net/;
  
negative.code: {
    kdeDerivation, kdeWrapper, lib, fetchgit, fetchpatch,
    extra-cmake-modules, kdoctools, kconfig, kinit, kparts
  }:
  
  