zeromq/zeromq3-x — pull request #26 by methodmissing (2012-08-05 00:06:22+00:00)
Title: Backport Martin Sustrik's 0MQ/2.1 wire format compatibility patch from Crossroads I/O [1]

- ZMQ_PROTOCOL option added
- libzmq ignores when unused flags are set to 1 (0MQ/2.1 bug)
- compatibility tests added
- Fixes LIBZMQ-409 ( https://zeromq.jira.com/browse/LIBZMQ-409 ), although a sock option is still required

1. https://github.com/crossroads-io/libxs/commit/7cfd1c58ba244ee0185043c3dac0617bd7a7b938