spf_template gnu &&
spf_url home  'http://www.xs4all.nl/~carlo17/which/' &&
spf_url watch 'http://www.xs4all.nl/~carlo17/which/' &&
spf_url src \
  "http://www.xs4all.nl/~carlo17/which/which-${spf_version?}.tar.gz" &&
case ${spf_version?} in
  2.1[68]) :;;
  *) spf_depend readline flags include;;
esac &&
spf_tested_version 2.20 &&
spf_tested_version 2.19 &&
spf_tested_version 2.18 &&
spf_tested_version 2.16