Missing include breaks build of tor-fw-helper in 0.2.5.3
If you use "./configure --enable-upnp && make", build with break on missing siphash.h in tor-fw-helper:
CC src/tools/tor-fw-helper/src_tools_tor_fw_helper_tor_fw_helper-tor-fw-helper.o
In file included from src/tools/tor-fw-helper/tor-fw-helper.c:25:
./src/common/container.h:10:21: error: siphash.h: No such file or directory
Seems that -I$(srcdir)/src/ext is required somewhere.