When trying to build e.g. 1.3.0-rc.1 or current master with Erlang/OTP R16B, one gets the following compile error:
mochifmt_records.erl:12: parameterized modules are no longer supported
mochifmt_records.erl:19: variable 'Recs' is unbound
R16B should definitively be supported in the next release. The fix could be as simple as upgrading mochiweb, as the recently released mochiweb v2.4.2 is R16B-compatible.