libxxf86dga-dev

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

X11 Direct Graphics Access extension library (development headers)
libXxf86dga provides the XFree86-DGA extension, which allows direct
graphics access to a framebuffer-like region, and also allows relative
mouse reporting, et al. It is mainly used by games and emulators for
games.
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This package contains the development headers for the library found in
libxxf86dga1. 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/libXxf86dga