do you need nxauth for client-side X2Go on Mac? Currently, nxauth only builds with the server-side nx-libs build (nx-libs-full). Or am I missing something?
nxauth is used as the local/client side X server authentication program (basically getting the auth cookie) on both Windows and Mac OS X, instead of xauth, by nxproxy. nxproxy *can* work without it by generating fake cookies, but I found it much more reliable with nxauth (and for what it's worth, on 10.4 using nxauth seems to be mandatory to connect to the X server.)
Yeah, sadly, nxauth builds within nx-X11 which is the "full" X server, but building it, pulling the binary + libNX_Xau.dylib out and redistributing is not a big deal.