I could not build ncempy on openSUSE Tumbleweed. I tried installing python3-qt5 and python3-matplotlib-qt5 but the error still occur. The error are shown below ...
SKIPPED [11] /home/travis/build/matplotlib/matplotlib/lib/matplotlib/tests/test_backend_qt.py:31: Qt5 binding already imported SKIPPED [1] /home/travis/build ...