anchor.diff:                       --set TK_LIBRARY "${tk}/lib/tk8.4" \
                        --prefix PATH : "${tk}/bin"
          done
  -     '' else "")
  +     '' else ''
  +      # don not wrap Tcl/Tk, replace them by notification scripts
  +       for prog in gitk git-gui git-citool
  +       do
  +         notSupported "$out/bin/$prog" "reinstall with config git = { guiSupport = true } set"
  +       done
  +     '')
   
      + ''# Wrap `git-clone'
          wrapProgram $out/bin/git-clone                   \
  
positive.code:         wrapProgram "$out/bin/git-svn"                  \
                       --set GITPERLLIB "$gitperllib"     \
                       --prefix PATH : "${subversion}/bin" ''
         else ''
         echo "NOT installing \`git-svn' since \`svnSupport' is false."
         rm $out/bin/git-svn '')
  
     + ''# Install man pages and Info manual
         make PERL_PATH="${perl}/bin/perl" cmd-list.made install install-info \
  
negative.code: 
    postInstall =
      ''
        notSupported(){
          echo -e "#\!/bin/sh\necho '`basename $1` not supported, $2'\nexit 1" > "$1"
          chmod +x $1
        }
  
        # Install Emacs mode.
        echo "installing Emacs mode..."
        ensureDir $out/share/emacs/site-lisp
  