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1. Create an overlay "portage" by description of the path for an overlay tree, that is, in "/etc/make.conf" you need to write a line
PORTDIR_OVERLAY="/usr/local/portage"
2. Create a directory "/usr/local/portage/dev-util/openscada/", then download the ebuild archive file from the official site and unpack it in the created folder.
cd /usr/local/portage/dev-util/openscada
wget http://ftp.oscada.org/OpenSCADA/LTS/Gentoo/openscada-0.9.4.ebuild.tar.bz2
tar -xvf openscada-0.9.4.ebuild.tar.bz2
3. You must specify the portage, that OpenSCADA is allowed to build on your platform. To do this, put the following line to the file "/etc/portage/package.keywords":
dev-util/openscada
4. Check: