This is what I get running startx:

OsVendorInit: can't open keyboard: Permission denied
System: `/usr/X11R6/lib/X11/xkb/xkbcomp -w 1 -R/usr/X11R6/lib/X11/xkb -xkm -m usa1 -em1 "The XKEYBOARD keymap compiler (xkbcomp) reports:" -emp "> " -eml "Errors from xkbcomp are not fatal to the X server" keymap/amiga /var/tmp/amiga.xkm'
Setting keyboard direct mode: Bad file descriptor

Fatal server error:
Can't set keyboard translation

_X11TransSocketUNIXConnect: Can't connect: errno = 61
giving up.
xinit:  Connection refused (errno 61):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.

 startx as root works fine, and I have been unable to determine
 where the permissions problem is. I followed INSTALL.X11 by the
 book, so hold your flames, please.