In the "Creating /etc/fstab" section, there is this paragraph:
The /dev/shm mount point for tmpfs is included to allow enabling POSIX-shared memory. The kernel must have the required support built into it for this to work (more about this is in the next section). Please note that very little software currently uses POSIX-shared memory. Therefore, consider the /dev/shm mount point optional. For more information, see Documentation/filesystems/tmpfs.txt in the kernel source tree.
I don't really know much of anything about the subject myself, but it seems strange that it says /dev/shm is "optional" when it's described as required during the LFS system build. Is that paragraph simply out-of-date?
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