debuging wxruby

I can't run my wxruby application because wxruby crash on every
application. I have made a stack dump and the libraries involved in the
crash is

ruby-1.8.7_p352
glib-2.30.3
cairo-1.10.2-r2
gtk+-2.24.5-r1
pixman-0.26.0
wxGTK-2.8.12.1
gtk-engines-2.20.2

As far as I can read on the web pixman is strongly involved but, is it
an error in pixman or in libraries calling pixman?

I have started to document the problem in this forum thread.
http://forums.gentoo.org/viewtopic-t-938578.html

I hope we can use our collective intelligence to solve this problem. It seams to be a cross library problem, so we will have to work together on this one.

The top of the stack dump look like this.

#0  0xb47a6d9d in _pixman_lookup_composite_function (toplevel=0x80be750, op=PIXMAN_OP_SRC, 
    src_format=262144, src_flags=1043063, mask_format=0, mask_flags=8192, 
    dest_format=PIXMAN_a8r8g8b8, dest_flags=34032255, out_imp=0xbfffb82c, out_func=0xbfffb828)
    at /var/tmp/portage/x11-libs/pixman-0.26.0/work/pixman-0.26.0/pixman/pixman-utils.c:74
#1  0xb4618b32 in pixman_image_composite32 (op=PIXMAN_OP_SRC, src=0x837cac0, mask=0x0, 
    dest=0x837cba8, src_x=0, src_y=0, mask_x=0, mask_y=0, dest_x=0, dest_y=0, width=8, 
    height=35)
    at /var/tmp/portage/x11-libs/pixman-0.26.0/work/pixman-0.26.0/pixman/pixman.c:682
#2  0xb62a7889 in _cairo_pattern_acquire_surface_for_gradient (pattern=0xbfffc84c, 
    dst=0x837c508, x=0, y=0, width=8, height=35, out=0xbfffbc74, attr=0xbfffbcc0)
    at cairo-pattern.c:1524
#3  0xb62a9a31 in _cairo_pattern_acquire_surface (pattern=0xbfffc84c, dst=0x837c508, x=0, y=0, 
    width=400, height=35, flags=0, surface_out=0xbfffbc74, attributes=0xbfffbcc0)
    at cairo-pattern.c:2534
#4  0xb62a9c15 in _cairo_pattern_acquire_surfaces (src=0xbfffc84c, mask=0x0, dst=0x837c508, 
    src_x=0, src_y=0, mask_x=0, mask_y=0, width=400, height=35, flags=0, src_out=0xbfffbc74, 
    mask_out=0xbfffbc70, src_attributes=0xbfffbcc0, mask_attributes=0xbfffbc78)
    at cairo-pattern.c:2613
#5  0xb62e1d38 in _cairo_xlib_surface_acquire_pattern_surfaces (display=0x837c3e8, 
    dst=0x837c508, src=0xbfffc84c, mask=0x0, src_x=0, src_y=0, mask_x=0, mask_y=0, width=400, 
    height=35, src_out=0xbfffbc74, mask_out=0xbfffbc70, src_attr=0xbfffbcc0, 
    mask_attr=0xbfffbc78) at cairo-xlib-surface.c:2299
#6  0xb62e21e2 in _cairo_xlib_surface_composite (op=CAIRO_OPERATOR_OVER, 
    src_pattern=0xbfffc84c, mask_pattern=0x0, abstract_dst=0x837c508, src_x=0, src_y=0, 
    mask_x=0, mask_y=0, dst_x=0, dst_y=0, width=400, height=35, clip_region=0x0)
    at cairo-xlib-surface.c:2466
#7  0xb62ba341 in _cairo_surface_composite (op=CAIRO_OPERATOR_OVER, src=0xbfffc84c, mask=0x0, 
    dst=0x837c508, src_x=0, src_y=0, mask_x=0, mask_y=0, dst_x=0, dst_y=0, width=400, 
    height=35, clip_region=0x0) at cairo-surface.c:1802
#8  0xb62bd7ce in _composite_rectangle (dst=0x837c508, op=CAIRO_OPERATOR_OVER, src=0xbfffc84c, 
    traps=0xbfffc11c, clip=0x0) at cairo-surface-fallback.c:762