The two issues on the repository has not been merged yet as of 2019.10.05, however is super important to compile and install. It's fine to apply these two pull requests by yourself before compile,

The problem occurs when I compiled g2opy on Mac OS X Mojave. The solution is to edit as follows: // this is code is one before edit .def("x", (double (Eigen::Quaterniond::*) () const) &Eigen::Quaterniond::x) .def("y", (double (Eigen::Quate…