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Solution: go back to using -Wl,--version-script. Use ax_check_vscript.m4 from the autoconf-archive to detect support on multiple platforms (eg Solaris ld(1) -M). libtool -export-symbols-regexp used ld(1) --retain-symbols-file under the hood, the latter lets some C++ weak symbols make their way into the dynamic symbols table, along with the zmq_* interface. The reason for such behavior is unknown to me.