anchor.diff:      | TeamCity -> getVersion tcBuildNumber
       | CCNet -> getVersion ccBuildLabel
       | Travis -> getVersion travisBuildNumber
  +    | AppVeyor -> getVersion appVeyorBuildNumber
       | LocalBuild -> getVersion localBuildLabel
   
   /// Is true when the current build is a local build.
  
positive.code:     | CCNet
      | Jenkins
      | Travis
      | LocalBuild
  
  /// The trace mode option.
  
negative.code: /// [omit]
  let ccBuildLabel = environVar "CCNETLABEL"
  
  /// AppVeyor build number
  /// [omit]
  let appVeyorBuildNumber = environVar "Appveyor_ProjectBuildNumber"
  
  /// The current build server
  let buildServer = 
      if hasBuildParam "jenkins_home" then Jenkins
      elif not (isNullOrEmpty tcBuildNumber) then TeamCity
      elif not (isNullOrEmpty ccBuildLabel) then CCNet
      elif not (isNullOrEmpty travisBuildNumber) then Travis
      elif not (isNullOrEmpty appVeyorBuildNumber) then AppVeyor
      else LocalBuild
  
  /// The current build version as detected from the current build server.
  