title: How to build app supports Old SDK Versions (minSdkVersion) in android
body: <p>When creating new project by wizard and gives errors, then it is so frustrated. </p>
  
  <p>I just create new project with MinSdk = 9 to make the app run on gingerbread
  this gives me the following Error:</p>
  
  <pre><code>Error:Execution failed for task ':app:processDebugManifest'.
  &gt; Manifest merger failed : uses-sdk:minSdkVersion 9 cannot be smaller than version 14 declared in library [com.android.support:appcompat-v7:26.0.0-alpha1] C:\Users\USER\.android\build-cache\dfb3187f39ea1ff94009f5d34353fff5cfc3daee\output\AndroidManifest.xml
      Suggestion: use tools:overrideLibrary="android.support.v7.appcompat" to force usage
  </code></pre>
  
  <p>and here is the gradle file </p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 26
      buildToolsVersion "26.0.0"
      defaultConfig {
          applicationId "com.example.com.testApp"
          minSdkVersion 9
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
      compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
      testCompile 'junit:junit:4.12'
  }
  </code></pre>
  
  <p>how to fix this?</p>