diff -Nru kwin-effect-xrdesktop-0.15.1/debian/changelog kwin-effect-xrdesktop-0.15.1/debian/changelog
--- kwin-effect-xrdesktop-0.15.1/debian/changelog	2020-07-24 03:33:29.000000000 +0000
+++ kwin-effect-xrdesktop-0.15.1/debian/changelog	2021-08-31 21:19:38.000000000 +0000
@@ -1,3 +1,10 @@
+kwin-effect-xrdesktop (0.15.1-1+rpi1) bookworm-staging; urgency=medium
+
+  * Apply upstream patch to fix build with kwin 5.21.5
+    (Closes: 993015)
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Tue, 31 Aug 2021 21:19:38 +0000
+
 kwin-effect-xrdesktop (0.15.1-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru kwin-effect-xrdesktop-0.15.1/debian/patches/kwin-5.21.5.patch kwin-effect-xrdesktop-0.15.1/debian/patches/kwin-5.21.5.patch
--- kwin-effect-xrdesktop-0.15.1/debian/patches/kwin-5.21.5.patch	1970-01-01 00:00:00.000000000 +0000
+++ kwin-effect-xrdesktop-0.15.1/debian/patches/kwin-5.21.5.patch	2021-08-31 21:18:21.000000000 +0000
@@ -0,0 +1,54 @@
+From d6f7664c57ae21bc05653ff2b496b51cbe5a4f7d Mon Sep 17 00:00:00 2001
+From: Christoph Haag <christoph.haag@collabora.com>
+Date: Sat, 30 Jan 2021 02:10:11 +0100
+Subject: [PATCH] Support kwin 5.20.90
+
+https://github.com/KDE/kwin/commit/9f2cb0ae1b6fa6a79158006714907abfac12929a
+---
+ src/VRMirror.cpp | 8 ++++++++
+ src/VRMirror.h   | 4 ++++
+ 2 files changed, 12 insertions(+)
+
+diff --git a/src/VRMirror.cpp b/src/VRMirror.cpp
+index e98c0b2..ee28746 100644
+--- a/src/VRMirror.cpp
++++ b/src/VRMirror.cpp
+@@ -612,11 +612,19 @@ void VRMirror::glibIterate()
+     }
+ }
+ 
++#if KWIN_EFFECT_API_VERSION_MINOR >= 232
++void VRMirror::prePaintScreen(KWin::ScreenPrePaintData &data, std::chrono::milliseconds presentTime)
++{
++    KWin::effects->prePaintScreen(data, presentTime);
++    lastPrePaint = QTime::currentTime();
++}
++#else
+ void VRMirror::prePaintScreen(KWin::ScreenPrePaintData &data, int time)
+ {
+     KWin::effects->prePaintScreen(data, time);
+     lastPrePaint = QTime::currentTime();
+ }
++#endif
+ 
+ void VRMirror::drawWindow(KWin::EffectWindow *w,
+                           int mask,
+diff --git a/src/VRMirror.h b/src/VRMirror.h
+index 5f06fd9..66d9f8d 100644
+--- a/src/VRMirror.h
++++ b/src/VRMirror.h
+@@ -87,7 +87,11 @@ class VRMirror : public KWin::Effect
+ 
+     void postPaintWindow(KWin::EffectWindow *w);
+     virtual void drawWindow(KWin::EffectWindow *w, int mask, const QRegion &region, KWin::WindowPaintData &data);
++#if KWIN_EFFECT_API_VERSION_MINOR >= 232
++    void prePaintScreen(KWin::ScreenPrePaintData &data, std::chrono::milliseconds presentTime);
++#else
+     void prePaintScreen(KWin::ScreenPrePaintData &data, int time);
++#endif
+     void postPaintScreen();
+ 
+     /* sometimes a windowDamaged signal is missing from kwin on continously
+-- 
+GitLab
+
diff -Nru kwin-effect-xrdesktop-0.15.1/debian/patches/series kwin-effect-xrdesktop-0.15.1/debian/patches/series
--- kwin-effect-xrdesktop-0.15.1/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ kwin-effect-xrdesktop-0.15.1/debian/patches/series	2021-08-31 21:18:32.000000000 +0000
@@ -0,0 +1 @@
+kwin-5.21.5.patch