title: Importing Facebook library in Android Studio: Could not find property 'ANDROID_BUILD_SDK_VERSION'
body: <p>I want to import a library project into my app but whenever I try to do so , Android Studio doesn't recognise it</p>
  <p>It also gives me errors in build.gradle ..</p>
  <p>The Library is : PagerSlidingTabStrip ....</p>
  <p>Here are some pictures :</p>
  <blockquote>
  <p><img src="https://i.stack.imgur.com/xAVb5.png" alt="enter image description here" /></p>
  <p><img src="https://i.stack.imgur.com/U4SWR.png" alt="enter image description here" /></p>
  </blockquote>
  <p>I have been trying to make it work for 3 days so far !!
  Please Help Me :)</p>
  <p><em><strong>EDIT:</strong></em></p>
  <pre><code>apply plugin: 'android-library'
  
  dependencies {
  compile 'com.android.support:support-v4:19.0.0'
  }
  
  android {
  compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)
  buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION
  
  defaultConfig {
      minSdkVersion 8
      targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
  }
  
  sourceSets {
      main {
          manifest.srcFile 'AndroidManifest.xml'
          java.srcDirs = ['src']
          res.srcDirs = ['res']
      }
  }
  }
  
   apply from: 'https://raw.github.com/chrisbanes/gradle-mvn-push/master/gradle-mvn-push.gradle'
  </code></pre>
  <p><em><strong>EDIT2 :</strong></em></p>
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  A problem occurred configuring project ':Sahertoday'.
  &gt; Could not resolve all dependencies for configuration ':Sahertoday:_debugCompile'.
  &gt; Could not find com.astuetz:pagerslidingtabstrip:1.0.1.
   Required by:
       Saher-3:Sahertoday:unspecified
  
  * Try:
   Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get         more log output.
  
   BUILD FAILED
  </code></pre>