anchor.diff:      runHook postCheck
     '';
   
  -  postInstall = ''
  -    mv $out/share/{doc,gtk-doc}
  +  postFixup = ''
  +    # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
  +    moveToOutput "share/doc" "$devdoc"
     '';
   
     passthru = {
  
positive.code: { lib
  , stdenv
  , fetchFromGitLab
  , docbook-xsl-nons
  , gi-docgen
  , gtk-doc
  , libxml2
  , meson
  , ninja
  , pkg-config
  
negative.code:   };
  
    nativeBuildInputs = [
      gi-docgen
      meson
      ninja
      pkg-config
  