[STUMP] How to fix such a error ?

[z_axis]

(ql:quickload :stumpwm)
To load "stumpwm":
  Load 1 ASDF system:
    stumpwm
; Loading "stumpwm"
[package cl-ppcre]................................
[package stumpwm].................................
[package stumpwm-user].......................
*** - eval: undefined function xlib::%gcontext-key->mask
The following restarts are available:
USE-VALUE      :R1      Input a value to be used instead of (fdefinition  
'xlib::%gcontext
-key->mask).
RETRY          :R2      Retry
STORE-VALUE    :R3      Input a new value for (fdefinition  
'xlib::%gcontext-key->mask).
RETRY          :R4      Retry compiling #<cl-source-file "stumpwm"  
"color">.
ACCEPT         :R5      Continue, treating compiling #<cl-source-file  
"stumpwm" "color">
as having been successful.
ABORT          :R6      Give up on "stumpwm"
ABORT          :R7      Abort main loop


I am using clisp-2.49.


Regards!