multiple definition of `atan2l' on the current Cygwin

[Warren Young]

On Apr 11, 2016, at 9:06 PM, Tatsuro MATSUOKA <tmacchant2@yahoo.co.jp> wrote:
> 
> In building the gnuplot

Why aren’t you using the gnuplot package in the Cygwin package repository?

> I have met the error of "multiple definition of `atan2l’".

This is doubtless because that function was just added to Cygwin in 2.5.0.

Perhaps gnuplot is providing its own copy due to a naive platform test?  Have you tried a clean reconfigure and rebuild?
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