Xlib.h does not have XSetIMValues

[Mikko Kortelainen]

I am trying to compile rxvt-unicode (urxvt) but it does not as there is a entry missing from Xlib.h . http://dpaste.com/77977/plain/
On freebsd:
lilian% pwd
/usr/local/include/X11
lilian% grep XSetIMValues *
Xlib.h:extern char *XSetIMValues(

But on hpux:
bash-3.2$ pwd
/usr/include/X11R6/X11
bash-3.2$ grep XSetIMValues *
Nothing!
bash-3.2$ ls | grep Xlib.h
Xlib.h

RXVT-Unicode:
http://software.schmorp.de/pkg/rxvt-unicode.html