Hello,

Gordon Steemson wrote:
> What is the story behind this variable, and why is it not apparently
> declared anywhere?

It's defined in POSIX system.  A reference is:

https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html

> Where is it supposed to be defined?

time.h should define it in POSIX system.  See:

https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html

IIUC, it's issues for POSIX compatibilities.
-- 

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