Installing postgis

yum install proj proj-devel

#get postgres source
cd contrib
svn co http://svn.refractions.net/postgis/trunk postgis
cd postgis
./autogen.sh
./configure --with-pgsql=/usr/local/pgsql/bin/pg_config
make && sudo make install
/usr/local/pgsql/bin/createlang plpgsql coupon
/usr/local/pgsql/bin/createlang plpgsql coupon -U postgres
/usr/local/pgsql/bin/psql -d coupon -f lwpostgis.sql -U postgres
/usr/local/pgsql/bin/psql -d coupon -f spatial_ref_sys.sql -U postgres