anchor.diff:      optionals
       platforms;
   
  -  version = "4.13";
  +  version = "4.13.1";
   
     baseUrls = [
       "https://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v${version}/src"
  
positive.code:     find $out -name "*.a" -delete
    '';
  
    meta = with stdenv.lib; {
      homepage = http://www.mozilla.org/projects/nspr/;
      description = "Netscape Portable Runtime, a platform-neutral API for system-level and libc-like functions";
  
negative.code: 
    src = fetchurl {
      urls = map (n: "${n}/nspr-${version}.tar.gz") baseUrls;
      hashOuput = false;
      sha256 = "5e4c1751339a76e7c772c0c04747488d7f8c98980b434dc846977e43117833ab";
    };
  
    prePatch = ''
  