- build 5.8.7 with thread support but don't install it

 - use the CPAN autobundle from the current 5.8.6 to fill in
       the non-core modules, including DBI

 - do our best to install DBD::Oracle on 5.8.7, even though
       this perl isn't fully "installed" the way that the
       DBD::Oracle readme says it should be

 - try a bunch of existing apps, including DBI access to oracle8,
       and assuming they work, do "make install" for 5.8.7