Make pybind11 dependency optional #307
Description
Building without pybind11 fails. Build log: https://launchpadlibrarian.net/474653062/buildlog_ubuntu-bionic-amd64.chimera_0.1.0-257~202004150348~ubuntu18.04.1_BUILDING.txt.gz
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Building without pybind11 fails. Build log: https://launchpadlibrarian.net/474653062/buildlog_ubuntu-bionic-amd64.chimera_0.1.0-257~202004150348~ubuntu18.04.1_BUILDING.txt.gz