Want to use xman on #FreeBSD? Start it this way to get manpages formatted right:
#!/bin/sh
export GROFF_NO_SGR=1
/usr/local/bin/xman
Before & after: https://computerfairi.es/media/4Ac1TAE-XvlGV9p_G0M https://computerfairi.es/media/9-5mWICKz0GBtbG1nXg
That is, unless GROFF_NO_SGR is set. The only places I found it documented were on the Internet (for Linux-specific xman weirdness) and in the grotty(1) manpage.