Installation fails where there is a space in the group name

[juanchanco]

I'm on a Mac on a Windows administered network. My unix group is "CORP\Domain Users" and it seems to be the space (probably the backslash too) that makes installing (at least with opam) fail at

install -o juan.chanco -g CORP\Domain Users -m 440 bps.init.mk /Users/juan.chanco/.opam/4.04.2/share/bsdowl

I can make it work by sudo-ing (which installs with group "wheel") and the chown-ing everything, but other packages that use bsdowl (like broken) have a similar problem when installing via opam.