Step 3 and 4: Generate interface file and compile module

3: Run 
Unix/DOS> f2py -m ext_gridloop -h ext_gridloop.pyf signatures.f
4: Run 
Unix/DOS> f2py -c --fcompiler=Gnu --build-dir tmp1 \
     -DF2PY_REPORT_ON_ARRAY_COPY=1 ext_gridloop.pyf gridloop.c
See 
src/py/mixed/Grid2D/C/f2py
for all the involved files

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