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From: Isaac Dunham <idunham@lavabit.com>
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Subject: Compatability: missing sys/vm86.h
Date: Tue, 10 Apr 2012 13:00:24 -0700
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sys/vm86.h is largely a wrapper for asm/vm86.h from linux-libc-dev, but
provides one other function (prototype per man 2 vm86): 

int vm86(unsigned long fn, struct vm86plus_struct *v86);

There are no feature test macros required.

This is needed for some versions of Xvesa/Xfbdev, as well as dev86,
dosemu, and a number of other programs.