To fix a failing
#cpan DBD::Oracle
complaining about missing header files, you can specify the INCLUDE location like the following

#cpan <<< "
o conf makepl_arg '-h /opt/oracle-client-11/sdk/include/'
install DBD::Oracle

"

With “o conf makepl_arg” we’ re just telling which parameters to pass to
#perl Makefile.PL

Obviously each module has its own ;)