if mktemp --version >/dev/null ^/dev/null # GNU
	complete -c mktemp -s d -l directory    -d 'create a directory, not a file'
	complete -c mktemp -s u -l dry-run      -d 'do not create anything; merely print a name (unsafe)'
	complete -c mktemp -s q -l quiet        -d 'suppress diagnostics about file/dir-creation failure'
	complete -c mktemp -l suffix -r         -d 'append SUFF to TEMPLATE'
	complete -c mktemp -l tmpdir            -d 'interpret TEMPLATE relative to DIR'
	complete -c mktemp -l help              -d 'display this help and exit'
	complete -c mktemp -l version           -d 'output version information and exit'
else # OS X
	complete -c mktemp -s d                 -d 'create a directory, not a file'
	complete -c mktemp -s q                 -d 'suppress diagnostics about file/dir-creation failure'
	complete -c mktemp -s t -r              -d 'generate a template using PREFIX and TMPDIR (if set)'
	complete -c mktemp -s u                 -d 'file will be unliked before mktemp exits (unsafe)'
end