diff --git a/debian/changelog b/debian/changelog
index c82e57e..8ead641 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -22,6 +22,14 @@ qt6-base (6.6.0+dfsg-1) experimental; urgency=medium
 
  -- Patrick Franz <deltaone@debian.org>  Wed, 11 Oct 2023 21:00:14 +0200
 
+ qt6-base (6.4.2+dfsg-19) unstable; urgency=medium
+
+   [ Patrick Franz ]
+   * Backport upstream patch to fix build with libxkbcommon 1.6.0
+     (Closes: #1054674).
+
+  -- Patrick Franz <deltaone@debian.org>  Sat, 28 Oct 2023 11:26:45 +0200
+
 qt6-base (6.4.2+dfsg-18) unstable; urgency=medium
 
   [ Helmut Grohne ]
diff --git a/debian/patches/libxkbcommon_1.6.0.diff b/debian/patches/libxkbcommon_1.6.0.diff
new file mode 100644
index 0000000..4dad63d
--- /dev/null
+++ b/debian/patches/libxkbcommon_1.6.0.diff
@@ -0,0 +1,34 @@
+From 8af35d27e8f02bbb99aef4ac495ed406e50e3cca Mon Sep 17 00:00:00 2001
+From: Liang Qi <liang.qi@qt.io>
+Date: Tue, 10 Oct 2023 14:08:48 +0200
+Subject: [PATCH] xkb: fix build with libxkbcommon 1.6.0 and later
+
+A few XKB_KEY_dead_* defines got removed from 1.6.0. See also
+https://github.com/xkbcommon/libxkbcommon/blob/6073565903488cb5b9a8d37fdc4a7c2f9d7ad04d/NEWS#L9-L14
+https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/merge_requests/70/diffs?commit_id=cb44799b72f611eb4c9d7cc185bc3b09e070be08
+
+Pick-to: 6.6 6.5 6.2 5.15
+Fixes: QTBUG-117950
+Change-Id: I55861868f2bb29c553d68365fa9b9b6ed01c9aea
+Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
+---
+
+diff --git a/src/gui/platform/unix/qxkbcommon.cpp b/src/gui/platform/unix/qxkbcommon.cpp
+index 26d87c5..7b61179 100644
+--- a/src/gui/platform/unix/qxkbcommon.cpp
++++ b/src/gui/platform/unix/qxkbcommon.cpp
+@@ -237,10 +237,14 @@
+         Xkb2Qt<XKB_KEY_dead_small_schwa,        Qt::Key_Dead_Small_Schwa>,
+         Xkb2Qt<XKB_KEY_dead_capital_schwa,      Qt::Key_Dead_Capital_Schwa>,
+         Xkb2Qt<XKB_KEY_dead_greek,              Qt::Key_Dead_Greek>,
++/* The following four XKB_KEY_dead keys got removed in libxkbcommon 1.6.0
++   The define check is kind of version check here. */
++#ifdef XKB_KEY_dead_lowline
+         Xkb2Qt<XKB_KEY_dead_lowline,            Qt::Key_Dead_Lowline>,
+         Xkb2Qt<XKB_KEY_dead_aboveverticalline,  Qt::Key_Dead_Aboveverticalline>,
+         Xkb2Qt<XKB_KEY_dead_belowverticalline,  Qt::Key_Dead_Belowverticalline>,
+         Xkb2Qt<XKB_KEY_dead_longsolidusoverlay, Qt::Key_Dead_Longsolidusoverlay>,
++#endif
+ 
+         // Special keys from X.org - This include multimedia keys,
+         // wireless/bluetooth/uwb keys, special launcher keys, etc.
diff --git a/debian/patches/series b/debian/patches/series
index f85d075..49c3dae 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,3 +1,6 @@
+# fixed in 6.6.1
+libxkbcommon_1.6.0.diff
+
 # Needs to be fixed upstream.
 Add-SH-detection.patch