anchor.diff:          mkdir -p $dropinDir/plugins
           cp -v ${srcPlugin} $dropinDir/plugins/${name}.jar
         '';
  -
       });
   
     # Helper for the case where the build directory has the layout of an
  
positive.code:     buildEclipsePluginBase (attrs // {
        srcs = [ srcFeature srcPlugin ];
  
        phases = [ "installPhase" ];
  
        installPhase = ''
          dropinDir="$out/eclipse/dropins/${name}"
  
          mkdir -p $dropinDir/features
  
negative.code:   # directories will be installed.
    buildEclipseUpdateSite = { name, ... } @ attrs:
      buildEclipsePluginBase (attrs // {
        dontBuild = true;
        doCheck = false;
  
        installPhase = ''
          dropinDir="$out/eclipse/dropins/${name}"
  