[CMake] problems linking with g++ on Ubuntu

[Davis Ford]

Hi, I have a project that I'm able to build fine on Mac OS with CMake, but
when I check same project out on Ubuntu 12.04, I'm getting undefined
reference errors at link time.

Here's the relevant section of the CMakeLists.txt file, and make VERBOSE=1
output for both Mac OS X (success) and Ubuntu 12.04 (failure)

https://gist.github.com/3776497

The specific failure is

In function `Comm_Create':
Comm.c:(.text+0x42): undefined reference to `zctx_new'

This function is defined in libczmq.a (which is being linked in the Make
output)

$ nm /usr/local/lib/libczmq.a  | grep zctx_new
00000010 T zctx_new
         U zctx_new
         U zctx_new
         U zctx_new
         U zctx_new
         U zctx_new
         U zctx_new
         U zctx_new


The other failure is

Comm.c:(.text+0x5c): undefined reference to `zsocket_new'

This function is also defined in libczmq.a

$ nm /usr/local/lib/libczmq.a  | grep zsocket_new
         U zsocket_new
         U zsocket_new
         U zsocket_new
00000000 T zsocket_new
         U zsocket_new
         U zsocket_new
         U zsocket_new

What am I missing here?
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