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