title: Error: No toolchains found in the NDK toolchains folder for ABI with prefix: llvm
body: <p>I want to compile an open source android project (Netguard) using gradel (<code>gradlew clean build</code>) But I encountered this Error:</p>
  
  <pre><code>A problem occurred configuring project ':app'.
  &gt; Exception thrown while executing model rule: NdkComponentModelPlugin.Rules#cre
  ateToolchains
     &gt; No toolchains found in the NDK toolchains folder for ABI with prefix: llvm
  </code></pre>
  
  <p>I serached but didn't find enything helping. Here is the main <code>build.gradle</code>:</p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle-experimental:0.6.0-alpha1'
      }
  }
  allprojects {
      repositories {
          jcenter()
      }
  }
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>And here is the <code>build.gradle</code> of the <code>app</code> project:</p>
  
  <pre><code>apply plugin: 'com.android.model.application'
  
  model {
      android {
          compileSdkVersion = 23
          buildToolsVersion = "23.0.2"
  
          defaultConfig.with {
              applicationId = "eu.faircode.netguard"
              minSdkVersion.apiLevel = 21
              targetSdkVersion.apiLevel = 23
              versionCode = 2016011801
              versionName = "0.76"
              archivesBaseName = "NetGuard-v$versionName-$versionCode"
          }
      }
      android.ndk {
          moduleName = "netguard"
          toolchain = "clang"
          ldLibs.add("log")
      }
      android.sources {
          main {
              jni {
                  source {
                      srcDir "src/main/jni/netguard"
                  }
                  exportedHeaders {
                  }
              }
          }
      }
      android.buildTypes {
          release {
              minifyEnabled = true
              proguardFiles.add(file('proguard-rules.pro'))
              ndk.with {
                  debuggable = true
              }
          }
      }
      android.buildTypes {
          debug {
              ndk.with {
                  debuggable = true
              }
          }
      }
      android.productFlavors {
          create("all") {
          }
      }
  }
  
  dependencies {
  
  
  compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:appcompat-v7:23.1.+'
      compile 'com.android.support:recyclerview-v7:23.1.+'
      compile 'com.squareup.picasso:picasso:2.5.+'
  }
  </code></pre>
  
  <p>And I'm using <code>gradle-2.9-all</code> and <code>android-ndk-r10e</code>. I don't know if I should mention anything else, so comment if you need any information.</p>