Solve cannot open /usr/share/sendmail-cf/m4/cf.m4

Q. I have made changes to the configuration of Sendmail but when I run:

# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

I get the following error:

m4:/etc/mail/sendmail.mc:10: cannot open /usr/share/sendmail-cf/m4/cf.m4: No such file or directory

How to fix it?

A. To resolve the above error, you must install the package sendmail-cf

# yum - and install sendmail-cf