Ubuntu 12.04LTS/64 comes with zmq 2.1.11 installable – which is a stable and relative new version – but of course only the 64bit version.
Therefore you have to install the 32bit version of the library via:
sudo apt-get install libzmq1:386
and in your ini-file (Linux installation of VASmalltalk) of your VASmalltalk application you should add an entry for mapping a logical filename to the specific library name:
[PlatformLibrary Name Mappings] .... libzmq=libzmq.so.1
and you can verify the result by executing:
which should return an array with the number 2, 1, 11.