anchor.diff:  
     l_set_misc = buildEnv {
       name = "l-set-misc";
  +    ignoreCollisions = true;
       paths = [
         pidgin
         texLiveFull
  
positive.code: 
    l_set_dev = buildEnv {
      name = "l-set-dev";
      paths = [
        # Programming tools
        git
  
negative.code: 
    l_set_office = buildEnv {
      name = "l-set-office";
      ignoreCollisions = true;
      paths = [
        evince
      ];
  