diff --git a/README.md b/README.md
index 366ae5a..77e3899 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 Building
 ========
-To build, run `./gradlew assembleDebug` or `./gradlew assembleRelease`.
+To create a debug apk, run `./gradlew assembleDebug`. Alternatively, you can use
+`.gradlew thinDebug` for a faster compile, but this requires Scala libraries installed
+with [Android-Scala-Installer](https://github.com/Arneball/Android-Scala-Installer) on your device.
+
+To create a release apk, run `./gradlew assembleRelease`.
 
 License
 =======
diff --git a/app/build.gradle b/app/build.gradle
index ccb1a62..7348f7f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,6 @@
+apply plugin: 'com.android.application'
+apply plugin: 'jp.leafytree.android-scala'
+
 buildscript {
     repositories {
         mavenCentral()
@@ -7,11 +10,21 @@ buildscript {
         classpath "jp.leafytree.gradle:gradle-android-scala-plugin:1.3.1"
     }
 }
-repositories {
-  jcenter()
+
+dependencies {
+    compile "com.android.support:support-v4:21.0.0"
+    // For `flat` debug config, as `flatProvided` is unknown.
+    provided "org.scala-lang:scala-library:2.11.4"
+    debugCompile "org.scala-lang:scala-library:2.11.4"
+    releaseCompile "org.scala-lang:scala-library:2.11.4"
+    compile("org.msgpack:msgpack-scala_2.11:0.6.11") {
+        transitive = false;
+    }
+    compile('org.msgpack:msgpack:0.6.11'){
+        transitive = false;
+    }
 }
-apply plugin: 'com.android.application'
-apply plugin: 'jp.leafytree.android-scala'
+
 
 android {
     compileSdkVersion 21
@@ -27,22 +40,22 @@ android {
 
     sourceSets {
         main {
-            scala {
-                srcDir "src/main/scala"
-            }
+            scala.srcDir "src/main/scala"
         }
 
         androidTest {
-            scala {
-                srcDir "src/androidTest/scala"
-            }
+            scala.srcDir "src/androidTest/scala"
         }
     }
 
     buildTypes {
+        thin {
+            minifyEnabled false
+            applicationIdSuffix ".debug"
+            signingConfig signingConfigs.debug
+        }
         debug {
-//            minifyEnabled true
-            proguardFile file("proguard-rules.pro")
+            minifyEnabled false
             applicationIdSuffix ".debug"
         }
         release {
@@ -51,6 +64,14 @@ android {
         }
     }
 
+    // Needed to rename `app-thin.apk` to `app-debug.apk` (because Android Studio doesn't let us
+    // specify a different apk name).
+    applicationVariants.all { variant ->
+        def apk = variant.outputFile;
+        def newName = apk.name.replace("app-thin", "app-debug");
+        variant.outputFile = new File(apk.parentFile, newName);
+    }
+
     // Avoid duplicate file errors during packaging.
     packagingOptions {
         exclude 'decoder.properties'
@@ -59,16 +80,3 @@ android {
         exclude 'META-INF/NOTICE'
     }
 }
-
-dependencies {
-    compile "com.android.support:support-v4:21.+"
-    provided "org.scala-lang:scala-library:2.11.4"
-    compile("org.msgpack:msgpack-scala_2.11:0.6.11") {
-      transitive = false;
-    }
-    compile('org.msgpack:msgpack:0.6.11'){
-      transitive = false;
-    }
-}
-
-
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 3049328..c7783cd 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,15 +8,13 @@
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 
     <uses-feature android:name="android.hardware.bluetooth" android:required="true" />
+
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
 
-        <uses-library android:name="s1"/>
-        <uses-library android:name="s2"/>
-        <uses-library android:name="s3"/>   
         <activity
             android:name=".activities.MainActivity"
             android:label="@string/app_name"
diff --git a/app/src/thin/AndroidManifest.xml b/app/src/thin/AndroidManifest.xml
new file mode 100644
index 0000000..24d4fc0
--- /dev/null
+++ b/app/src/thin/AndroidManifest.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.nutomic.ensichat">
+
+    <application>
+
+        <uses-library android:name="s1" />
+        <uses-library android:name="s2" />
+        <uses-library android:name="s3" />
+
+    </application>
+
+</manifest>