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Split-/usr on Linux became so broken, that even Gentoo maintainers decided they can't fix it
(gitweb.gentoo.org)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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They were defined sure, but without distribution adherence they weren’t actually, this has been the case for a long time. Out of all the distributions, Gentoo is probably one of the most sensitive to this issue since most others have used initramfs or initrd for decades and Gentoo has always made it optional.
If the post was about FHS adherence I’d agree more.