Problem compiling gnunet-0.8.1

Hello,

trying to compile gnunet-0.8.1 using libmicrohttpd-0.4.0 I found that I
have to replace the following:

src/transports/http.c:874

-       gg = MHD_create_response_from_callback (SIZE_UNKNOWN,
+       gg = MHD_create_response_from_callback (-1,

to get it compiled, because /usr/include/microhttpd.h doesn't define
the symbol, but mentions, that -1 should be used for the purpose.

Kind regards!
ulf