I am trying to install DBD::Oracle using the CPAN shell in Strawberry Perl. I initially experienced an error because the Makefile
could not locate an OCI
Strawberry Perl 5.20 (since May, 2014) ships with DBD::Oracle, as long as you install instantclient 11.x version it works out of the box. See http://strawberryperl.com/release-notes/5.20.0.1-64bit.html
Newly added DBD::Oracle - you have to install 64bit Oracle Instant Client 11.x and make sure you have OCI.DLL in your PATH