commit 4ca3d0d94370002430b5131520a11c06b23bdcaa
Author: Martin Gräßlin <mgraesslin@kde.org>
Date:   Mon Apr 10 06:52:44 2017 +0200

    [platforms/drm] Explicitly request event context version 2
    
    Summary:
    Libdrm 2.4.78 introduces a version 2 and if KWin gets built against it
    our code would break. Given that this change is for Plasma/5.8 branch.
    
    Closes T5839
    
    Reviewers: #kwin, #plasma
    
    Subscribers: plasma-devel, kwin
    
    Tags: #kwin
    
    Maniphest Tasks: T5839
    
    Differential Revision: https://phabricator.kde.org/D5380

diff --git a/plugins/platforms/drm/drm_backend.cpp b/plugins/platforms/drm/drm_backend.cpp
index dc2b79696..9e9cb60e1 100644
--- a/plugins/platforms/drm/drm_backend.cpp
+++ b/plugins/platforms/drm/drm_backend.cpp
@@ -61,6 +61,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define DRM_CAP_CURSOR_HEIGHT 0x9
 #endif
 
+#define KWIN_DRM_EVENT_CONTEXT_VERSION 2
+
 namespace KWin
 {
 
@@ -240,7 +242,7 @@ void DrmBackend::openDrm()
             }
             drmEventContext e;
             memset(&e, 0, sizeof e);
-            e.version = DRM_EVENT_CONTEXT_VERSION;
+            e.version = KWIN_DRM_EVENT_CONTEXT_VERSION;
             e.page_flip_handler = pageFlipHandler;
             drmHandleEvent(m_fd, &e);
         }