new_contents: class libpng(Wig):
  	tarball_uri = 'ftp://ftp-osl.osuosl.org/pub/libpng/src/libpng16/libpng-{RELEASE_VERSION}.tar.gz'
  	last_release_version = '1.6.30'
  	git_uri = 'git://git.code.sf.net/p/libpng/code'
  
subject: Create libpng.py