anchor.diff:      xelb = callPackage ({ cl-generic, elpaBuild, emacs, fetchurl, lib }:
       elpaBuild {
           pname = "xelb";
  -        version = "0.12";
  -        src = fetchurl {
  -          url = "https://elpa.gnu.org/packages/xelb-0.12.tar";
  -          sha256 = "0i9n0f3ibj4a5pwcsvwrah9m0fz32m0x6a9wsmjn3li20v8pcb81";
  +        version = "0.13";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/xelb-0.13.tar";
  +          sha256 = "0sfygy6ihjwszhn6a81fz2yn70rr7vpygl7z49vz4rsd8s0fdgjc";
           };
           packageRequires = [ cl-generic emacs ];
           meta = {
  
positive.code:       }) {};
      exwm = callPackage ({ elpaBuild, fetchurl, lib, xelb }: elpaBuild {
          pname = "exwm";
          version = "0.16";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/exwm-0.16.tar";
            sha256 = "0c4w5k9lzqj8yzhdqipdb4fs7ld2qklc6s137104jnfdvmrwcv2i";
          };
          packageRequires = [ xelb ];
          meta = {
  
negative.code:     el-search = callPackage ({ cl-print, elpaBuild, emacs, fetchurl, lib, stream }:
      elpaBuild {
          pname = "el-search";
          version = "1.6";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/el-search-1.6.tar";
            sha256 = "18pv2l6rl8f9x0yjn4iyf6g94c0ly5mizqg0vxr3m420bkbyk95h";
          };
          packageRequires = [ cl-print emacs stream ];
          meta = {
  