Ordinarily, when you build sendmail, the
unformatted manual pages (those that end in a digit other than zero)
are formatted and overwrite the corresponding file that ends in zero.
When you run Build it looks like this:
groff -Tascii -man sendmail.8 > sendmail.0 || cp sendmail.0.dist sendmail.0
If you don't want to format the manual pages (that
is, to leave the zero-suffixed files untouched), you can define this
confNO_MAN_BUILD macro. Then, when you run
Build, the preceding formatting line (or lines)
will be missing.