new_contents: import os, sys
  folders = os.listdir(sys.path[0])
  direcs = {}
  for folder in folders:
      if folder == 'tools':
          continue
      File, ext = os.path.splitext(folder)
      if ext == '':
          for dep in os.listdir(File):
              if dep == 'BUILD.py':
                  continue
              File, ext = os.path.splitext(dep)
              if ext == '.py':
                  direcs[File] = sys.path[0] + '/' + folder
  f = open('DEPS.BUILD','w')
  for dep in direcs:
      f.write(dep + '=' + direcs[dep] + '\n')
  
subject: Create MainBuild.py