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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, I have been playing around with Doom's source code, the 90s one, and= I have noticed that it has a header included named errnos.h that I have re= cently learned that it was actually present in glibc beginning from 2.0.0 (= I think) until 2.0.7. Could anyone shed light on why it was added to glibc = and later removed? https://sources.debian.org/src/glibc/2.0.7t-1/sysdeps/unix/sysv/linux/errno= s.h/ https://github.com/id-Software/DOOM/blob/master/linuxdoom-1.10/i_video.c#L49 --_000_ROAP284MB2203AF5516D8A7FEB4F452558A4E2ROAP284MB2203BRAP_--