X and Fluxbox :: xkb rules file error

dsl@box:~$ setxkbmap
Couldn't interpret _XKB_RULES_NAMES property
Use defaults: rules - 'xfree86' model - 'pc101' layout - 'us'
Couldn't find rules file (xfree86)

In Xfree86 i want to set layout to es but this happens.

pd: how can i get missings xkb rules files?

thanks

original here.