anchor.diff:      buildInputs = [ pkgs.spidermonkey_1_8_5 ];
     };
   
  -  xdebug = if isPhp72 then xdebug26 else if isPhp7 then xdebug25 else xdebug23;
  +  xdebug = if isPhp7 then xdebug26 else xdebug23;
   
     xdebug23 = assert !isPhp7; buildPecl {
       name = "xdebug-2.3.1";
  
positive.code:     };
    isPhpOlder55 = pkgs.lib.versionOlder php.version "5.5";
    isPhp7 = pkgs.lib.versionAtLeast php.version "7.0";
    isPhp72 = pkgs.lib.versionAtLeast php.version "7.2";
    isPhpOlder7 = pkgs.lib.versionOlder php.version "7.0";
  
    apcu = if isPhp7 then apcu51 else apcu40;
  
  
negative.code:     checkTarget = "test";
    };
  
    xdebug26 = assert isPhp7; buildPecl {
      name = "xdebug-2.6.0";
  
      sha256 = "1p6b54ypi5lq4ka3pyy2gswdf1d5vjb9y8lp9fqcp3zn7g04q9mm";
  
      doCheck = true;
      checkTarget = "test";
  