To run the wxpython based GUI:

    export GRASS_PYTHON=python2.7 (or your local python version)
    grass -gui

To map gcc for numpy, add:

    libgcc_s.so.1   gcc6/libgcc_s.so.1
    libgomp.so.1    gcc6/libgomp.so.1
    libssp.so.0     gcc6/libssp.so.0
    libstdc++.so.6  gcc6/libstdc++.so.6

to %%LOCALBASE%%/etc/libmap.d/gcc.conf. Use your local gcc version
instead of gcc6.

This is required for some modules using fortran.