[SunHELP] nroff

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Trying to compile cyrus-sasl 2.1.20 and got an error regarding nroff:
--snip--
gmake[2]: Entering directory `/u01/patches/qa/cyrus-sasl-2.1.20/saslauthd'
/bin/bash ./config/mkinstalldirs /usr/local/sbin
  config/install-sh -c saslauthd /usr/local/sbin/saslauthd
nroff -mdoc ./saslauthd.mdoc > ./saslauthd.8
nroff: Cannot find library -mdoc

gmake[2]: *** [saslauthd.8] Error 2
gmake[2]: Leaving directory `/u01/patches/qa/cyrus-sasl-2.1.20/saslauthd'
gmake[1]: *** [install-am] Error 2
gmake[1]: Leaving directory `/u01/patches/qa/cyrus-sasl-2.1.20/saslauthd'
gmake: *** [install-recursive] Error 1

My first reaction is to upgrade nroff but not seeing a stand alone package anywhere.  Any ideas?

Solaris 8