Hi George, We are going to release version 0.4 on Monday, so this is the last chance of getting AIX and HP-UX in. As far as I understand, only a bit of code allowing the particular platform in autotools is missing, something like: *aix*) AC_DEFINE(ZMQ_HAVE_AIX, 1, [Have AIX OS]) ;; Am I right or is there anything else missing? Thanks. Martin