I am confused with all the packages apt-cache outputs:
$ apt-cache search libzmq
libzmq-dbg - lightweight messaging kernel (debugging symbols)
libzmq-dev - lightweight messaging kernel (development files)
libzmq-java - ZeroMQ Java bindings (jzmq)
libzmq-java-doc - Documentation for ZeroMQ Java bindings (jzmq)
libzmq-jni - ZeroMQ Java bindings (jzmq)
libzmq1 - lightweight messaging kernel (shared library)
libzmq3-dev - lightweight messaging kernel (development files)
libzmq5 - lightweight messaging kernel (shared library)
libzmq5-dbg - lightweight messaging kernel (debugging symbols)
libzmqpp-dev - High-level C++ bindings …