In the xinitrc file that is shipped with the product we need to point to the right unix 'id' command on solaris:

bash-3.00$ /usr/xpg4/bin/id -u
100
bash-3.00$ id -u
id: illegal option -- u
Usage: id [-ap] [user]


...
# fix broken $UID on some system...
if test "x$UID" = "x"; then
         UID=`/usr/xpg4/bin/id -u`
fi
...