anchor.diff:      "--without-neverbleed"
       "--without-cython"
       "--without-mruby"
  +  ] ++ optionals (!isLib) [
  +    "--with-boost=${boost.dev}"
  +    "--with-boost-libdir=${boost.lib}/lib"
     ];
   
     meta = with stdenv.lib; {
  
positive.code: 
    buildInputs = optionals (!isLib) [
      boost
      jansson
      jemalloc
      libev
      libxml2
      openssl
      zlib
  
negative.code: , fetchurl
  
  , boost
  , cunit
  , jansson
  , jemalloc
  , libev
  , libevent
  , libxml2
  , openssl
  , zlib
  