The Tutorial shows you How to Install and Getting-Started with the Latest Eclipse 2023-03 R IDE C/C++ 64-bit on Linux Gentoo 12.1 Amd64 KDE4 Desktop.
There is the Possibility also to Install the Eclipse Platform via apt-get But the Gentoo Repositories are still Back to Eclipse 3.7 Indigo.
So at the Moment if you want Install the Latest Eclipse 2023-03 R Build on Gentoo 12 you will Need to Download and Install Eclipse 2023-03 R C/C++ Development Release for Linux.
Hence, here we Proceed Directly to Download and Installation of the Whole Eclipse for C/C++ Development Linux Release.
The Content give Focus Only to the Essentials Instructions and Commands to make it Easier to Follow.
To the Guide Bottom you find a Link to Create a Launcher and Hello-World Application Quick Starting.

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Download Eclipse C/C++ Oxygen R IDE:
Eclipse 2023-03 R IDE C/C++ Linux 64-bit -
Double-Click on Archive and Extract Eclipse into /tmp
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Open Terminal Window
(Press “Enter” to Execute Commands) -
Relocating Eclipse.
sudo chown -R root:root /tmp/eclipse && mv /tmp/eclipse /opt/
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Starting Eclipse from Terminal.
Making a Symlink
ln -s /opt/eclipse/eclipse /usr/local/bin/eclipse
After you can Start Eclipse from Terminal simply with:
eclipse
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Create an Eclipse Desktop Launcher for Easy-Starting:
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Eclipse C++ Getting-Started SetUp & Hello-World: