diff --git a/project/libs/xz.jar b/project/libs/xz.jar
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Binary files a/project/libs/xz.jar and /dev/null differ
diff --git a/readme.txt b/readme.txt
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--- a/readme.txt
+++ b/readme.txt
@@ -11,7 +11,9 @@ Installation
 ============
 
 Install latest Android SDK and NDK from http://developer.android.com/index.html
-You'll need to install Java Ant too.
+You'll need to install Java Ant too. Since for building apk files some java classes are needed as well,
+it is recommended to install OpenJDK and its development files. (On RPM based distros 
+usually called java-x.x.x-openjdk and java-x.x.x-openjdk-devel)
 The application will run on Android OS 1.6 and above, but will use features from Android 4.4 if available.
 The most supported environment for this port is Linux, MacOs should be okay too.
 If you're developing under Windows you'd better install Portable Ubuntu, to get proper Linux environment