README.md: Update the build dependencies section to cover the Android APK dependencies.

README.md

 This branch contains the files needed to build espeak on the android platform.
 It is derived from the eyes-free project.
 
-## Prerequisits
-
-To build eSpeak for Android, you need to have the following installed and
-configured correctly:
-
-1.  Android SDK
-2.  Android NDK
-3.  wxWidgets 2.8 (for espeakedit when building `android/res/raw/espeakdata.zip`)
-
-If you are building with Eclipse, you will also need:
-
-1.  Eclipse
-2.  Android Developer Tools (ADT) for Eclipse
-
-If you are building on the command line, you will also need either:
-
-1.  ant (e.g. run `sudo apt-get install ant` on a Debian-based distribution), or
-2.  gradle 1.7, which can be installed from the
-    [Ubuntu PPA](https://launchpad.net/~cwchien/+archive/gradle/+files/gradle-1.7_1.0-0ubuntu1_all.deb)
-    debian file (including on Debian systems)
-
 ## Build Dependencies
 
 In order to build eSpeak, you need:
 3.  wxWidgets development libraries (needed to build and run espeakedit
     to compile the phoneme data).
 
-Optionally, you need:
+In order to build the APK, you need:
+
+1.  the [Android SDK](http://developer.android.com/sdk/index.html);
+2.  the [Android NDK](http://developer.android.com/tools/sdk/ndk/index.html);
+3.  Gradle 1.7.
+
+In order to use Android Studio, you will also need:
+
+1.  [Android Studio](http://developer.android.com/sdk/installing/studio.html).
+
+In order to use Eclipse, you will also need:
 
-1.  the pulseaudio development library to enable pulseaudio output;
-2.  the portaudio development library to enable portaudio output.
+1.  Eclipse;
+2.  the [Android Developer Tools](http://developer.android.com/tools/sdk/eclipse-adt.html) (ADT) for Eclipse.
 
 ### Debian
 
 | autotools     | `sudo apt-get install make autoconf automake libtool pkg-config` |
 | c++ compiler  | `sudo apt-get install gcc g++`                                   |
 | wxWidgets     | `sudo apt-get install libwxgtk2.8-dev`                           |
+| gradle        | [gradle-1.7_1.0-0ubuntu1_all.deb](https://launchpad.net/~cwchien/+archive/gradle/+files/gradle-1.7_1.0-0ubuntu1_all.deb) |
 
 ## Building with Gradle