0.65/AIX

[Kurt Hornik]

>>>>> Martin Maechler writes:

ToV> Sorry, but why do you need _XOPEN_SOURCE_EXTENDED to be defined?  And
ToV> why does -D_XOPEN_SOURCE_EXTENDED=2 work, albeit noisely?

> This is used to be the only flag (from the many I tried about a year ago) 
> for which
>      1/0  
>      is.finite(1)
>      atanh(1)
> worked .

Hmm ... Compilation-wise it seems that -D_ALL_SOURCE works o.k. for me.
Now, this gives

> 1/0 + 1/0# Inf
[1]INF
> 1/0 - 1/0# NaN
[1]NaNQ

which is only sort of o.k.???

For the time being, I'll commit this version ...

-k
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