gtk+2.1.1 on Slackware current

[younker <younker dreamscope com cn>]

I installed slackware 9 current and I have installed fcpackage 2.0 
then I compile pango 1.1.2 and gtk+ 2.1.1 but when I run the program gtk-demo, 
there is a segment fault.

use gdb to debug the message shows 

Starting program: /root/gtk2/bin/gtk-demo

** (gtk-demo:15026): WARNING **: Cannot open font file for font Luxi Sans 10

Program received signal SIGSEGV, Segmentation fault.
0x40758f94 in XftCharIndex () from /usr/lib/libXft.so.2
(gdb) bt
#0  0x40758f94 in XftCharIndex () from /usr/lib/libXft.so.2
#1  0x4074897c in __libc_utmp_lock () from /usr/lib/libXft.so.2
Cannot access memory at address 0x43

I can run gtk-demo from gtk-2.0.6 correctly.

who can tell me what's the matter?

Am I missing something?