Using "has" is more slick because which(1) is not always there.
Signed-off-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NAmos Kong <akong@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>