compile sendmail 8.9.3

I want upgrade my 8.8.8 sendmail to version 8.9.3
starting Build, I've get error:

# ./Build
Configuration: os=OSF1, rel=V4.0, rbase=V4, rroot=V4.0, arch=alpha, sfx=
Making in obj.OSF1.V4.0.alpha
groff -Tascii -mandoc aliases.5 > aliases.0
sh: groff: not found
*** Exit 1

what may be wrong?
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It means you don't have groff installed. You can get and build groff ( or you could hack the distribution to use nroff (but then you'll have to find & install the mandoc macros).

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