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DRM_RDWR was not defined until libdrm 2.4.68. However, in configure.ac we only require libdrm >= 2.4.55. Seems silly to to bump minimum libdrm version for a simple define. Thus, define DRM_RDWR if it's not defined. This fixes compilation error introduced in: commit 922031b0 Author: Nicolas Dufresne <nicolas.dufresne@collabora.com> Date: Tue Sep 12 12:07:13 2017 -0400 kms: Export DMABuf from Dumb buffer when possible https://bugzilla.gnome.org/show_bug.cgi?id=787593 Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>
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