1. hardware / OpenGL support
if run in hardware mode (done by `opengl hardware` in MATLAB),
got error: `can't open i965_dri.so`
then `export LIBGL_DEBUG=verbose` in shell and run MATLAB again,
found a CXXABI error.
ended up finding `$MATLAB_DIR/sys/os/glnxa64/libstdc++.so.6.0.20` not supporting ABI1.3.9 (seen by `strings`)

  workaround: `ln -sf /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/libstdc++.so.6.0.22 $MATLAB_DIR/sys/os/glnxa64/libstdc++.so.6.0.20`

2. Psychtoolbox Screen.mexa64 missing everything
`AssertOpenGL` in MATLAB threw out an error that everything is missing (libc included...)
then `!echo $LD_LIBRARY_PATH` in MATLAB revealed sys lib not included

  workaround: `export LD_LIBRARY_PATH=/lib:/usr/lib:$LD_LIBRARY_PATH` in shell before run MATLAB

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life is hard