Using the 0.10-devel branch, including boost/network.hpp and building with clang -Wall

cpp-netlib/boost/network/protocol/http/client/connection/async_normal.hpp:253:17: error:
unused variable 'short_read_error' [-Werror,-Wunused-variable]
static long short_read_error = 335544539;
^
1 error generated.