#!/bin/sh export GROFF_NO_SGR=1 /usr/local/bin/xman
GROFF_NO_SGR needs to be set when starting xman on FreeBSD because during compiling, xman.c checks which OS it's being compiled on & hardwires nroff -mandoc as its page formatting aid if it detects the BSDs. However, nroff's mandoc macros output ANSI escape codes, while xman expects typewriter-style back up & overstrike codes.
Add the following to the your script starting xman:
if [ -z "$MANPATH" ]; then export MANPATH=`manpath`; fi
xman relies on the MANPATH variable being set, but fresh installs don't set it (relying on /usr/bin/manpath as well instead).