libxxf86vm-dev

Package contains libraries, required by other applications as dependencies. Do not install separately.

X11 XFree86 video mode extension library (development headers)
libXxf86vm provides an interface to the XFree86-VidModeExtension
extension, which allows client applications to get and set video mode
timings in extensive detail. It is used by the xvidtune program in
particular.
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This package contains the development headers for the library found in
libxxf86vm1. Non-developers likely have little use for this package.
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More information about X.Org can be found at:

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This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libXxf86vm