systemProp.http.proxyHost=proxy ip
systemProp.http.proxyPort=port
systemProp.http.proxyUser=my user name
systemProp.http.proxyPassword=my password

A problem occurred configuring root project 'pmdemo'.
> Could not resolve all dependencies for configuration ':classpath'.
> Could not resolve com.android.tools.build:gradle:1.3.1.
 Required by:
     :pmdemo:unspecified
  > Could not resolve com.android.tools.build:gradle:1.3.1.
     > Could not get resource 'http://jcenter.bintray.com/com/android/tools/
       build/gradle/1.3.1/gradle-1.3.1.pom'.
        > Could not GET 'http://jcenter.bintray.com/com/android/tools/build/
  gradle/1.3.1/gradle-1.3.1.pom'. Received status code 403 from server:
  Forbidden