sendmail - where are the .m4-files ?

Hi list, I'm trying to re-configure sendmail with some additional features. So I edited linux.mc and did the m4-command. Now the system complains, that it can't find several .m4-files One of the errors is: /etc/mail/linux.mc:173: m4: Cannot open /usr/share/sendmail/hack/use_names.m4: No such name or directory Hmm, checked my system and found that there really is no such file on the whole disk. Where can I get this file from ? Maybe the reason is that I updated the sendmail some time ago with rpm. What now ? Thanks in advance. --- Stephan