version=4

opts="repacksuffix=+dfsg,dversionmangle=s/\+dfsg//g,repack,compression=xz" \
  https://www.tbi.univie.ac.at/RNA/  .*/download/sourcecode/.*/ViennaRNA-@ANY_VERSION@@ARCHIVE_EXT@

# Alternatively use
#   https://github.com/ViennaRNA/ViennaRNA/releases