Build instructions:
-------------------
1. Install the Geo-Calc-XS module if not installed already
2. Extract the Geo-Calc-XS-0.25.tar.gz into directory Geo-Calc-XS-0.25
3. cd Geo-Calc-XS-0.25
4. perl Makefile.PL
5. make
6. make test
7. make install