"python setup.py install" met problem on ubuntu

[dumppool]

python/bolt/config.i:47: Warning 315: Nothing known about 'Eigen::RowMajor'.
swigging cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i to cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp
swig -python -c++ -o cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Illegal token '�'.
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Syntax error in input(1).
error: command 'swig' failed with exit status 1

OS: ubuntu16.04, python version:anaconda python 3.8

[dawe]

Same error on OS X

[…]
swigging cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i to cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp
swig -python -c++ -o cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Illegal token '?'.
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Syntax error in input(1).
error: command 'swig' failed with exit status 1

[dblalock]

Thanks for filing this, and for the informative error messages. Gonna go ahead and consolidate this into #4, but feel free to reopen if you think this issue is different.