diff -ur qtbase-opensource-src-5.4.0-rc-old_xcb/configure qtbase-opensource-src-5.4.0-rc-old_xkbcommon/configure
--- qtbase-opensource-src-5.4.0-rc-old_xcb/configure	2014-11-29 03:07:40.000000000 +0100
+++ qtbase-opensource-src-5.4.0-rc-old_xkbcommon/configure	2014-11-29 03:32:16.000000000 +0100
@@ -5144,7 +5144,7 @@
 fi
 
 # Detect libxkbcommon
-MIN_REQ_XKBCOMMON="0.4.1"
+MIN_REQ_XKBCOMMON="0.3.0"
 # currently only xcb platform plugin supports building xkbcommon
 if [ "$CFG_XCB" != "no" ]; then
     if [ "$CFG_XKBCOMMON" != "no" ] && [ "$CFG_XKBCOMMON" != "qt" ]; then
diff -ur qtbase-opensource-src-5.4.0-rc-old_xcb/src/plugins/platforms/xcb/qxcbkeyboard.cpp qtbase-opensource-src-5.4.0-rc-old_xkbcommon/src/plugins/platforms/xcb/qxcbkeyboard.cpp
--- qtbase-opensource-src-5.4.0-rc-old_xcb/src/plugins/platforms/xcb/qxcbkeyboard.cpp	2014-11-29 03:29:53.000000000 +0100
+++ qtbase-opensource-src-5.4.0-rc-old_xkbcommon/src/plugins/platforms/xcb/qxcbkeyboard.cpp	2014-11-29 03:35:36.000000000 +0100
@@ -971,7 +971,7 @@
     }
 
     QList<int> result;
-    int baseQtKey = keysymToQtKey(sym, modifiers, lookupString(kb_state, keycode));
+    int baseQtKey = keysymToQtKey(sym, modifiers, keysymToUnicode(sym));
     result += (baseQtKey + modifiers); // The base key is _always_ valid, of course
 
     xkb_mod_index_t shiftMod = xkb_keymap_mod_get_index(xkb_keymap, "Shift");
@@ -1008,7 +1008,7 @@
                 continue;
 
             Qt::KeyboardModifiers mods = modifiers & ~neededMods;
-            qtKey = keysymToQtKey(sym, mods, lookupString(kb_state, keycode));
+            qtKey = keysymToQtKey(sym, mods, keysymToUnicode(sym));
             if (!qtKey || qtKey == baseQtKey)
                 continue;
 
@@ -1462,7 +1462,7 @@
             return;
     }
 
-    QString string = lookupString(xkb_state, code);
+    QString string = keysymToUnicode(sym);
     int count = string.size();
     string.truncate(count);
 
@@ -1535,12 +1535,18 @@
     }
 }
 
-QString QXcbKeyboard::lookupString(struct xkb_state *state, xcb_keycode_t code) const
+QString QXcbKeyboard::keysymToUnicode(xcb_keysym_t sym) const
 {
     QByteArray chars;
-    chars.resize(1 + xkb_state_key_get_utf8(state, code, 0, 0));
-    // equivalent of XLookupString
-    xkb_state_key_get_utf8(state, code, chars.data(), chars.size());
+    int bytes;
+    chars.resize(7);
+
+    bytes = xkb_keysym_to_utf8(sym, chars.data(), chars.size());
+
+    if (bytes == -1)
+        qWarning("QXcbKeyboard::handleKeyEvent - buffer too small");
+    chars.resize(bytes-1);
+
     return QString::fromUtf8(chars);
 }
 
diff -ur qtbase-opensource-src-5.4.0-rc-old_xcb/src/plugins/platforms/xcb/qxcbkeyboard.h qtbase-opensource-src-5.4.0-rc-old_xkbcommon/src/plugins/platforms/xcb/qxcbkeyboard.h
--- qtbase-opensource-src-5.4.0-rc-old_xcb/src/plugins/platforms/xcb/qxcbkeyboard.h	2014-11-29 03:07:40.000000000 +0100
+++ qtbase-opensource-src-5.4.0-rc-old_xkbcommon/src/plugins/platforms/xcb/qxcbkeyboard.h	2014-11-29 03:32:16.000000000 +0100
@@ -75,7 +75,7 @@
     void handleKeyEvent(xcb_window_t sourceWindow, QEvent::Type type, xcb_keycode_t code, quint16 state, xcb_timestamp_t time);
 
     void resolveMaskConflicts();
-    QString lookupString(struct xkb_state *state, xcb_keycode_t code) const;
+    QString keysymToUnicode(xcb_keysym_t sym) const;
     int keysymToQtKey(xcb_keysym_t keysym) const;
     int keysymToQtKey(xcb_keysym_t keysym, Qt::KeyboardModifiers &modifiers, QString text) const;
     void printKeymapError(const char *error) const;