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<DIV><FONT face=Arial color=#000000 size=2>Dear Frank,</FONT></DIV>
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<DIV><FONT face=Arial size=2>Thanks to your help, I could figure out how to fix the problem already. I checked the PETSc website and found out that from 2.3.1 version onwards the libpetscfortran.a library has been removed (fortran interface & c interface now go into the same library). So I manually edited the relevant libraries that should be included in the config file make.extra.defn. It works fine now.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Best regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Tri.</FONT> </DIV></BODY></HTML>