title: NDKBuild Failure
body: <p>I'm having trouble getting my NDK to compile properly in Android Studio. Whenever I try running to compile I am getting the following error.</p>
  
  <blockquote>
    <p>Error:Execution failed for task ':app:ndkBuild'.
    A problem occurred starting process 'command 'ndk-build.cmd''</p>
  </blockquote>
  
  <p>I have the following setup</p>
  
  <p><img src="https://i.stack.imgur.com/L1P2O.png" alt="enter image description here"></p>
  
  <p>And my build.gradle file is the following.</p>
  
  <pre><code>import org.apache.tools.ant.taskdefs.condition.Os
  
  apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 21
      buildToolsVersion "21.1.2"
  
      defaultConfig {
          applicationId "edu.uky.cs.www.diagramaphone"
          minSdkVersion 14
          targetSdkVersion 21
          versionCode 1
          versionName "1.0"
  
          sourceSets.main{
              jniLibs.srcDir 'src/main/libs'
              jni.srcDirs = [] //disable automatic ndk-build call
          }
          project.ext.versionCodes = ['armeabi':1, 'armeabi-v7a':2, 'arm64-v8a':3, 'mips':5, 'mips64':6, 'x86':8, 'x86_64':9] //versionCode digit for each supported ABI, with 64bit&gt;32bit and x86&gt;armeabi-*
          android.applicationVariants.all { variant -&gt;
              // assign different version code for each output
              variant.outputs.each { output -&gt;
                  output.versionCodeOverride =
                          project.ext.versionCodes.get(output.getFilter(com.android.build.OutputFile.ABI), 0) * 1000000 + defaultConfig.versionCode
              }
          }
          // call regular ndk-build(.cmd) script from app directory
          task ndkBuild(type: Exec) {
              if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                  commandLine 'ndk-build.cmd', '-C', file('src/main').absolutePath
              } else {
                  commandLine 'ndk-build', '-C', file('src/main').absolutePath
              }
          }
          tasks.withType(JavaCompile) {
              compileTask -&gt; compileTask.dependsOn ndkBuild
          }
          //ndk {
            //  moduleName "shape-detect"
              //cFlags "-DANDROID_NDK -D_DEBUG DNULL=0" // Define some macros
              //ldLibs "EGL", "GLESv3", "dl", "log"         // Link with these libraries!
              //stl "stlport_shared"                        // Use shared stlport library
          //}
  
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(include: ['*.jar'], dir: 'libs')
      compile 'com.android.support:appcompat-v7:21.0.3'
      compile project(':libraries:tess-two')
      compile project(':libraries:opencv')
  }
  </code></pre>
  
  <p>At this point I'm lost as to what can be wrong. I've followed several tutorials to try setting up the NDK to work properly, but I keep getting the error I showed above. Can anyone here provide some feedback on what I need to do in order to get the NDK to compile?</p>
  
  <p>EDIT: Here's the entire message that occurs.</p>
  
  <pre><code>Information:Gradle tasks [:app:assembleDebug]
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:compileDebugNdk UP-TO-DATE
  :app:checkDebugManifest
  :app:preReleaseBuild UP-TO-DATE
  :libraries:opencv:compileLint
  :libraries:opencv:copyReleaseLint UP-TO-DATE
  :libraries:opencv:mergeReleaseProguardFiles UP-TO-DATE
  :libraries:opencv:preBuild UP-TO-DATE
  :libraries:opencv:preReleaseBuild UP-TO-DATE
  :libraries:opencv:checkReleaseManifest
  :libraries:opencv:prepareReleaseDependencies
  :libraries:opencv:compileReleaseAidl UP-TO-DATE
  :libraries:opencv:compileReleaseRenderscript UP-TO-DATE
  :libraries:opencv:generateReleaseBuildConfig UP-TO-DATE
  :libraries:opencv:generateReleaseAssets UP-TO-DATE
  :libraries:opencv:mergeReleaseAssets UP-TO-DATE
  :libraries:opencv:generateReleaseResValues UP-TO-DATE
  :libraries:opencv:generateReleaseResources UP-TO-DATE
  :libraries:opencv:packageReleaseResources UP-TO-DATE
  :libraries:opencv:processReleaseManifest UP-TO-DATE
  :libraries:opencv:processReleaseResources UP-TO-DATE
  :libraries:opencv:generateReleaseSources UP-TO-DATE
  :libraries:opencv:compileReleaseJava UP-TO-DATE
  :libraries:opencv:processReleaseJavaRes UP-TO-DATE
  :libraries:opencv:packageReleaseJar UP-TO-DATE
  :libraries:opencv:compileReleaseNdk UP-TO-DATE
  :libraries:opencv:packageReleaseJniLibs UP-TO-DATE
  :libraries:opencv:packageReleaseLocalJar UP-TO-DATE
  :libraries:opencv:packageReleaseRenderscript UP-TO-DATE
  :libraries:opencv:bundleRelease UP-TO-DATE
  :libraries:tess-two:compileLint
  :libraries:tess-two:copyReleaseLint UP-TO-DATE
  :libraries:tess-two:mergeReleaseProguardFiles UP-TO-DATE
  :libraries:tess-two:preBuild UP-TO-DATE
  :libraries:tess-two:preReleaseBuild UP-TO-DATE
  :libraries:tess-two:checkReleaseManifest
  :libraries:tess-two:prepareReleaseDependencies
  :libraries:tess-two:compileReleaseAidl UP-TO-DATE
  :libraries:tess-two:compileReleaseRenderscript UP-TO-DATE
  :libraries:tess-two:generateReleaseBuildConfig UP-TO-DATE
  :libraries:tess-two:generateReleaseAssets UP-TO-DATE
  :libraries:tess-two:mergeReleaseAssets UP-TO-DATE
  :libraries:tess-two:generateReleaseResValues UP-TO-DATE
  :libraries:tess-two:generateReleaseResources UP-TO-DATE
  :libraries:tess-two:packageReleaseResources UP-TO-DATE
  :libraries:tess-two:processReleaseManifest UP-TO-DATE
  :libraries:tess-two:processReleaseResources UP-TO-DATE
  :libraries:tess-two:generateReleaseSources UP-TO-DATE
  :libraries:tess-two:compileReleaseJava UP-TO-DATE
  :libraries:tess-two:processReleaseJavaRes UP-TO-DATE
  :libraries:tess-two:packageReleaseJar UP-TO-DATE
  :libraries:tess-two:compileReleaseNdk UP-TO-DATE
  :libraries:tess-two:packageReleaseJniLibs UP-TO-DATE
  :libraries:tess-two:packageReleaseLocalJar UP-TO-DATE
  :libraries:tess-two:packageReleaseRenderscript UP-TO-DATE
  :libraries:tess-two:bundleRelease UP-TO-DATE
  :app:prepareComAndroidSupportAppcompatV72103Library UP-TO-DATE
  :app:prepareComAndroidSupportSupportV42103Library UP-TO-DATE
  :app:prepareDiagramaphoneLibrariesOpencvUnspecifiedLibrary UP-TO-DATE
  :app:prepareDiagramaphoneLibrariesTessTwoUnspecifiedLibrary UP-TO-DATE
  :app:prepareDebugDependencies
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:generateDebugResources UP-TO-DATE
  :app:mergeDebugResources UP-TO-DATE
  :app:processDebugManifest UP-TO-DATE
  :app:processDebugResources UP-TO-DATE
  :app:generateDebugSources UP-TO-DATE
  :app:ndkBuild FAILED
  Error:Execution failed for task ':app:ndkBuild'.
  &gt; A problem occurred starting process 'command 'ndk-build.cmd''
  Information:BUILD FAILED
  Information:Total time: 2.226 secs
  Information:1 error
  Information:0 warnings
  Information:See complete output in console
  </code></pre>