code: def generate(env):
      
      if not exists(env):
        return
  
      env['WIXCANDLEFLAGS'] = ['-nologo']
      env['WIXCANDLEINCLUDE'] = []
      env['WIXCANDLECOM'] = '$WIXCANDLE $WIXCANDLEFLAGS -I $WIXCANDLEINCLUDE -o ${TARGET} ${SOURCE}'
  
      env['WIXLIGHTFLAGS'].append( '-nologo' )
      env['WIXLIGHTCOM'] = "$WIXLIGHT $WIXLIGHTFLAGS -out ${TARGET} ${SOURCES}"
      env['WIXSRCSUF'] = '.wxs'
      env['WIXOBJSUF'] = '.wixobj'
  
      object_builder = SCons.Builder.Builder(
          action      = '$WIXCANDLECOM',
          suffix      = '$WIXOBJSUF',
          src_suffix  = '$WIXSRCSUF')
  
      linker_builder = SCons.Builder.Builder(
          action      = '$WIXLIGHTCOM',
          src_suffix  = '$WIXOBJSUF',
          src_builder = object_builder)
  
      env['BUILDERS']['WiX'] = linker_builder
docs: Add Builders and construction variables for WiX to an Environment.