anchor.diff:  
   
     # Build ViewVC.
  -  viewvc = import ../../../services/subversion/src/viewvc {
  +  viewvc = import ../../../../services/subversion/src/viewvc {
       inherit (pkgs) fetchurl stdenv python enscript;
       inherit urlPrefix reposDir adminAddr subversion;
     };
  
positive.code: 
    
    # Build our custom authentication modules.
    authModules = import ../../../services/subversion/src/auth {
      inherit (pkgs) stdenv apacheHttpd;
    };
  
  
negative.code: 
  
    # Build WebSVN.
    websvn = import ../../../../services/subversion/src/websvn {
      inherit (pkgs) fetchurl stdenv writeText enscript gnused diffutils;
      inherit urlPrefix reposDir subversion;
      cacheDir = tmpDir;
  