title: Can't build SceneBuild from openjfx source code and setup
body: <p>I'm trying to build JavaFX sceneBuilder on my laptop I've dowloaded the source code from OpenJFx project and successfully build the SDK but during scene builder build i've got the following error, I'm a little bit confused since I'm completely digiune of gradle i don't understand where i should put the required property, in which folder or which configuration file i should modify, and why grade is running ant tasks, I've not ant installed on my machine (it's not in the prerequisite
  of the openjfx wiki).</p>
  
  <p>Many thanks</p>
  
  <pre><code>Galileo openjfx $ gradle sceneBuilderAppJar
  :buildSrc:generateGrammarSource UP-TO-DATE
  :buildSrc:compileJava UP-TO-DATE
  :buildSrc:compileGroovy UP-TO-DATE
  :buildSrc:processResources UP-TO-DATE
  :buildSrc:classes UP-TO-DATE
  :buildSrc:jar UP-TO-DATE
  :buildSrc:assemble UP-TO-DATE
  :buildSrc:compileTestJava UP-TO-DATE
  :buildSrc:compileTestGroovy UP-TO-DATE
  :buildSrc:processTestResources UP-TO-DATE
  :buildSrc:testClasses UP-TO-DATE
  :buildSrc:test UP-TO-DATE
  :buildSrc:check UP-TO-DATE
  :buildSrc:build UP-TO-DATE
  MACOSX_MIN_VERSION = 10.7
  MACOSX_SDK_PATH = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk
  OS_NAME: mac os x
  OS_ARCH: x86_64
  JAVA_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
  JDK_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
  java.runtime.version: 1.8.0_40-b27
  java version: 1.8.0_40
  java build number: 27
  jdk.runtime.version: 1.8.0_40-b27
  jdk version: 1.8.0_40
  jdk build number: 27
  minimum java build number: 132
  CONF: Debug
  NUM_COMPILE_THREADS: 1
  COMPILE_TARGETS: mac
  COMPILE_FLAGS_FILES: buildSrc/mac.gradle
  HUDSON_JOB_NAME: not_hudson
  HUDSON_BUILD_NUMBER: 0000
  PROMOTED_BUILD_NUMBER: 00
  PRODUCT_NAME: OpenJFX
  RAW_VERSION: 8.0.60
  RELEASE_NAME: 8u60
  RELEASE_MILESTONE: ea
  UPDATE_STUB_CACHE: false
  The CompileOptions.useAnt property has been deprecated and is scheduled to be removed in Gradle 2.0. There is no replacement for this property.
  :apps:scenebuilderAppJar FAILED
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':apps:scenebuilderAppJar'.
  &gt; The following error occurred while executing this line:
    /Users/fabiofrumento/openjfx/apps/scenebuilder/build.xml:19: The following error occurred while executing this line:
    /Users/fabiofrumento/openjfx/apps/scenebuilder/SceneBuilderKit/nbproject/build-impl.xml:86: The J2SE Platform is not correctly set up.
     Your active platform is: JDK_1.8, but the corresponding property "platforms.JDK_1.8.home" is not found in the project's properties files.
     Either open the project in the IDE and setup the Platform with the same name or add it manually.
     For example like this:
         ant -Duser.properties.file=&lt;path_to_property_file&gt; jar (where you put the property "platforms.JDK_1.8.home" in a .properties file)
      or ant -Dplatforms.JDK_1.8.home=&lt;path_to_JDK_home&gt; jar (where no properties file is used)
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
  
  BUILD FAILED
  
  Total time: 7.228 secs
  Galileo openjfx $
  </code></pre>