To use the dr overlay you need to emerge layman and add that overlay:
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emerge -va layman
echo "source /var/lib/layman/make.conf" >> /etc/portage/make.conf
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nano -w /etc/layman/layman.cfg
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overlays : https://api.gentoo.org/overlays/repositories.xml
https://raw.github.com/cerebrum/dr/master/repo.xml
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layman -a dr
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layman -s dr
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layman -S
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printf '%s\n' "games-strategy/openra" >> /etc/portage/package.accept_keywords
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layman -a dotnet
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printf '%s\n' "dev-lang/mono" >> /etc/portage/package.accept_keywords
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emerge -1 dev-lang/mono
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emerge -av openra
You can also install some development tools such as editor by adding tools USE-flag into openra portage package.use.
If you have any questions you can ask me in IRC. But I recommend read the following manual first:
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less /usr/share/doc/openra-20150118/README.gentoo.bz2
P.S. P.S. The following posts there are outdated except of announcements of the new ebuilds in the end.