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Installing zmq gem on Mountain Lion Mac OS X

I decided to play with ZeroMQ on my Mac. Had to spend about an hour installing the zmq gem, hope this post saves you the trouble.

Install ZeroMQ

First I tried to install ZeroMQ using brew. $ brew install zeromq It installed ZeroMQ version 3.2.2. Gem install zmq failed with following error...

$ ARCHFLAGS="-arch x86_64" gem install zmq -- --with-zmq-dir=/usr/local
Building native extensions.  This could take a while...
ERROR:  Error installing zmq:
    ERROR: Failed to build gem native extension.

        /Users/girish/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb --with-zmq-dir=/usr/local
checking for zmq.h... yes
checking for zmq_init() in -lzmq... yes
Cool, I found your zmq install...
creating Makefile

make
compiling rbzmq.c
rbzmq.c:968:7: error: use of undeclared identifier 'ZMQ_RECOVERY_IVL_MSEC'
        case ZMQ_RECOVERY_IVL_MSEC:
             ^
rbzmq.c:990:10: error: use of undeclared identifier 'ZMQ_HWM'
    case ZMQ_HWM:
         ^
rbzmq.c:991:10: error: use of undeclared identifier 'ZMQ_SWAP'
    case ZMQ_SWAP:
         ^
...

After googling for some time, it turned out that the zmq gem is not updated for the latest stable version 3.2.2 of ZeroMQ, it works (basically installs) with version 2.2.0.

Install ZeroMQ 2.2.0 from sources

$ wget http://download.zeromq.org/zeromq-2.2.0.tar.gz
$ tar xfz zeromq-2.2.0.tar.gz
$ cd zeromq-2.2.0
$ ./configure
$ make
$ sudo make install

Install zmq gem

Finally install the zmq gem

$ ARCHFLAGS="-arch x86_64" gem install zmq  -- --with-zmq-dir=/usr/local --with-zmq-lib=/usr/local/lib and --with-zmq-include=/usr/local/include
Building native extensions.  This could take a while...
Successfully installed zmq-2.1.4
1 gem installed

And bravo it worked!