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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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Date: Sun, 6 Aug 2017 11:04:26 +0200
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building again hdf5-1.8.18 on latest cygwin I hit

error: ‘SIG_SETMASK’ undeclared

removing  "-std=c99" from CFLAGS solves the issue.

As before the "-std=c99" was not causing any problem , it is not clear 
to me if the current behavior is correct or a side effect of latest
cygwin header reshuffle.

Regards
Marco









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