title: Error : Failed to find: com.android.support:support-v4:20.0.+
body: <p>I have imported a project in Android Studio that was built in it. I require v4 and v7 library in the project. This is how my build.gradle looks like</p>
  
  <p>build.gradle</p>
  
  <pre><code>apply plugin: 'android-library'
  
  android {
      compileSdkVersion 19
      buildToolsVersion '20'
      defaultConfig {
          applicationId 'com.example.sdk'
          minSdkVersion 9
          targetSdkVersion 19
          versionCode 1
          versionName '1.0'
      }
      buildTypes {
          release {
              runProguard false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
      productFlavors {
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:appcompat-v7:20.0.+'
      compile 'com.android.support:support-v4:20.0.+'
  }
  </code></pre>
  
  <p>When I sync with gradle then it always gives error message </p>
  
  <blockquote>
    <p>Failed to find: com.android.support:support-v4:20.0.+ &amp; Failed to find: com.android.support:appcompat-v7:20.0.+ </p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/cuZrk.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/ypvoM.png" alt="enter image description here"></p>
  
  <p>Please support &amp; thanks in advance.</p>