the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.

Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here.  Not 5 or 10 depending on the architecture.

More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802

android-project/AndroidManifest.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Replace org.libsdl.app with the identifier of your game below, e.g.
+     com.gamemaker.game
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.libsdl.app"
+      android:versionCode="1"
+      android:versionName="1.0"
+      android:installLocation="auto">
+
+    <!-- Create a Java class extending SDLActivity and place it in a
+         directory under src matching the package, e.g.
+         	src/com/gamemaker/game/MyGame.java
+
+         then replace "SDLActivity" with the name of your class (e.g. "MyGame")
+         in the XML below.
+
+         An example Java class can be found in README-android.txt
+    -->
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/ic_launcher"
+                 android:allowBackup="true"
+                 android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+                 android:hardwareAccelerated="true" >
+        <activity android:name="SDLActivity"
+                  android:label="@string/app_name"
+                  android:configChanges="keyboardHidden|orientation"
+                  >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <!-- Android 2.3.3 -->
+    <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="12" />
+
+    <!-- OpenGL ES 2.0 -->
+    <uses-feature android:glEsVersion="0x00020000" /> 
+
+    <!-- Allow writing to external storage -->
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
+</manifest>