anchor.diff:  
     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
  
positive.code:                      --set TK_LIBRARY "${tk}/lib/tk8.4" \
                       --prefix PATH : "${tk}/bin"
         done
       '' else "")
  
     + ''# Wrap `git-clone'
         wrapProgram $out/bin/git-clone                   \
  
negative.code:         wrapProgram "$out/bin/git-svn"                  \
                       --set GITPERLLIB "$gitperllib"     \
                       --prefix PATH : "${subversion}/bin" ''
         else '' # replace git-svn by notification script
          notSupported $out/bin/git-svn "reinstall with config git = { svnSupport = true } set"
         '')
  
     + ''# Install man pages and Info manual
         make PERL_PATH="${perl}/bin/perl" cmd-list.made install install-info \
  