Passing build options to pkg

[LUK ShunTim]

Hello,

I tried to install the geometry package from octave-forge and this is 
the error I encountered.

<error>
octave:1> pkg install geometry-1.0.2.tar.gz
In file included from /usr/include/hdf5.h:23,
                 from /usr/include/octave-2.9.13/octave/ov.h:34,
                 from /usr/include/octave-2.9.13/octave/oct-obj.h:33,
                 from /usr/include/octave-2.9.13/octave/ov-fcn.h:33,
                 from /usr/include/octave-2.9.13/octave/ov-builtin.h:29,
                 from /usr/include/octave-2.9.13/octave/defun-int.h:29,
                 from /usr/include/octave-2.9.13/octave/defun-dld.h:31,
                 from /usr/include/octave-2.9.13/octave/oct.h:36,
                 from tsearch.cc:22:
/usr/include/H5public.h:53:20: error: mpi.h: No such file or directory
/usr/include/H5public.h:55:21: error: mpio.h: No such file or directory
...
</error>

It seems to be a header location problem. In my version of octave2.9 
from debian/sid, hdf support is provided by lam and the mpi headers live 
in /usr/include/lam instead of the usual /usr/include.

So how to pass build options to pkg, to solve such non-standard 
header/library location problems?

Regards,
ST
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