Re: undefined symbol: shm_open (ppc64le and aarch64)

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* Tom Callaway:

> So, R links with rt if this configure check succeeds:
>
> AC_CHECK_LIB(rt, clock_gettime)
>
> Sure enough, on aarch64 and ppc64le, there is no clock_gettime in
> librt.so.1. I'm not sure _why_, but there is probably a good reason.

Hah!

We moved clock_gettime to libc.so.6 in glibc 2.17, so that it is
available without -lrt as well.  But we forgot to turn the legacy
definitions into compatibility symbols, so they are still being picked
up with -lrt.  This should be easy enough to fix.

Thanks,
Florian
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