spf_template gnu &&
#spf_url home  'http://www.lysator.liu.se/~nisse/nettle/' &&
spf_url watch 'http://www.lysator.liu.se/~nisse/archive/' &&
spf_url src \
  "http://www.lysator.liu.se/~nisse/archive/nettle-${spf_version?}.tar.gz" &&
spf_depend gmp     degree optional &&
spf_depend openssl degree optional flags lib &&
spf_tested_version 2.1