Similar post few weeks ago

Remember to actually *READ* the README file! Especially if you have any problems.

***  If you have problems...
     read all the log printed above, and the README and README.help.txt files.
     (Of course, you have read README by now anyway, haven't you?)

http://search.cpan.org/dist/DBD-Oracle/README

If you're setting INC= you have to set LIBS= also, as in LIBS='-L/path/to/where/occi/lives  -locci -lclntsh -lpthread'