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From: Dan Nicolaescu <dann@gnu.org>
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Subject: <sys/ioctl.h> on msdos
Date: Wed, 17 Nov 2010 23:42:13 -0500
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Does msdos have <sys/ioctl.h> ?
In a few places 
#ifndef MSDOS
is used to avoid including it.
Other places use HAVE_SYS_IOCTL_H
process.c includes it unconditionally in the non-msdos part.

It would be nicer to include it unconditionally everywhere, or to use
the same conditional everywhere.