A little overlay for unixODBC
According this forum thread, with these addition unixODBC on 64bit linux will be able to connect oracle databases.
Copy paste how to: mkdir -p /usr/local/portage
# clone the GIT repository
git clone git:https://github.com/bonyiii/unixODBC.git /usr/local/portage
# add the overlay to your make.conf
cat >> /etc/make.conf <<\EOF
PORTDIR_OVERLAY="${PORTDIR_OVERLAY} /usr/local/portage"
EOF
# install unixODBC
emerge -av unixODBC