anchor.diff:  
           pcntl = {
             configureFlags = [ "--enable-pcntl" ];
  -        };
  -
  -        pcre = {
  -          configureFlags = ["--with-pcre-regex=${pcre.dev} PCRE_LIBDIR=${pcre}"];
  -          buildInputs = [ pcre ];
           };
   
           readline = {
  
positive.code:       enableParallelBuilding = true;
  
        nativeBuildInputs = [ pkgconfig ];
        buildInputs = [ flex bison ]
          ++ lib.optional stdenv.isLinux systemd;
  
        CXXFLAGS = lib.optional stdenv.cc.isClang "-std=c++11";
  
negative.code: 
        configureFlags = [
          "--with-config-file-scan-dir=/etc/php.d"
          "--with-pcre-regex=${pcre.dev} PCRE_LIBDIR=${pcre}"
        ] ++ lib.optional stdenv.isDarwin "--with-iconv=${libiconv}"
          ++ lib.optional stdenv.isLinux  "--with-fpm-systemd";
  
  