Problem in gnustep with latest cairo package

Hi, I'm a gnustep developer and I'm having a problem with latest pixman
and cairo packages. Cairo is the default backend for gnustep. The
problem seems to be related with glx. In a normal installation with
pixman 0.28.2 and cairo 1.12.8, all apps crash at startup. The solution
I found is compile gnustep-back without support for glx. Isn't clear
for me if this is a bug on gnustep or in cairo or pixman. Here is the
backtrace I get when launch a gnustep app. Any advice will be
appreciate. Thanks.

Program received signal SIGSEGV, Segmentation fault.
_pixman_implementation_lookup_composite (toplevel=0x816f170, op=PIXMAN_OP_SRC, 
    src_format=PIXMAN_x8r8g8b8, src_flags=42429183, mask_format=0, 
    mask_flags=8192, dest_format=PIXMAN_a8r8g8b8, dest_flags=34032255, 
    out_imp=0xbfffc7e4, out_func=0xbfffc7e0) at pixman-implementation.c:96
96		if (info->op == op			&&
(gdb) backtrace
#0  _pixman_implementation_lookup_composite (toplevel=0x816f170, 
    op=PIXMAN_OP_SRC, src_format=PIXMAN_x8r8g8b8, src_flags=42429183, 
    mask_format=0, mask_flags=8192, dest_format=PIXMAN_a8r8g8b8, 
    dest_flags=34032255, out_imp=0xbfffc7e4, out_func=0xbfffc7e0)
    at pixman-implementation.c:96
#1  0xb52ad0bb in pixman_image_composite32 (op=<optimized out>, src=0x0, 
    mask=0xb56cc6d0, dest=0x1, src_x=-1251162432, src_y=1, mask_x=-1251162484, 
    mask_y=1, dest_x=-1251162496, dest_y=1, width=0, height=0) at pixman.c:673
#2  0xb552d840 in draw_image_boxes (_dst=0x826fd78, image=0x8272748, 
    boxes=0xbfffcd18, dx=0, dy=0) at cairo-xlib-render-compositor.c:270
#3  0xb55145ce in upload_boxes (boxes=0xbfffcd18, extents=0xbfffcf80, 
    compositor=<optimized out>) at cairo-traps-compositor.c:1331
#4  clip_and_composite_boxes (compositor=0xb55824e0, extents=0xbfffcf80, 
    boxes=0xbfffcd18) at cairo-traps-compositor.c:1725
#5  0xb5515099 in _cairo_traps_compositor_paint (_compositor=0xb55824e0, 
    extents=0xbfffcf80) at cairo-traps-compositor.c:2036
#6  0xb54b8354 in _cairo_compositor_paint (compositor=0xb55824e0, 
    surface=0x826fd78, op=CAIRO_OPERATOR_SOURCE, source=0xbfffd2bc, 
    clip=0x8272878) at cairo-compositor.c:65
#7  0xb553260c in _cairo_xlib_surface_paint (_surface=0x826fd78, 
    op=CAIRO_OPERATOR_SOURCE, source=0xbfffd2bc, clip=0x8272878)
    at cairo-xlib-surface.c:1524
#8  0xb550082f in _cairo_surface_paint (surface=0x826fd78, 
---Type <return> to continue, or q <return> to quit---
    op=CAIRO_OPERATOR_SOURCE, source=0xbfffd2bc, clip=0x8272878)
    at cairo-surface.c:2006
#9  0xb54c1161 in _cairo_gstate_paint (gstate=0x8272128) at cairo-gstate.c:1067
#10 0xb54b223e in *INT_cairo_paint (cr=0x8271fb8) at cairo.c:1999
#11 0xb55cf8aa in -[CairoGState DPSimage:::::::::::] (self=0x8271f34, 
    _cmd=0xb55ed128, matrix=0x827253c, pixelsWide=64, pixelsHigh=64, 
    bitsPerSample=8, samplesPerPixel=3, bitsPerPixel=24, bytesPerRow=192, 
    isPlanar=0 '\000', hasAlpha=0 '\000', colorSpaceName=0xb7fb0954, 
    data=0xbfffd5fc) at CairoGState.m:1183
#12 0xb559a821 in -[GSContext(NSGraphics) NSDrawBitmap:::::::::::] (
    self=0x826f984, _cmd=0xb55fd610, rect=..., pixelsWide=64, pixelsHigh=64, 
    bitsPerSample=8, samplesPerPixel=3, bitsPerPixel=24, bytesPerRow=192, 
    isPlanar=0 '\000', hasAlpha=0 '\000', colorSpaceName=0xb7fb0954, 
    data=0xbfffd5fc) at GSContext.m:919
#13 0xb55d1a68 in -[CairoContext(Ops) GSDrawImage::] (self=0x826f984, 
    _cmd=0xb7efb900, rect=..., imageref=0x8266d54) at CairoContext.m:208
#14 0xb7c59398 in -[NSBitmapImageRep draw] (self=0x8266d54, _cmd=0xb7f37ab8)
    at NSBitmapImageRep.m:1387
#15 0xb7cda046 in -[NSImageRep drawAtPoint:] (self=0x8266d54, _cmd=0xb7f351b0, 
    aPoint=...) at NSImageRep.m:521
#16 0xb7cd6933 in -[NSImage drawRepresentation:inRect:] (self=0x8268b4c, 
    _cmd=0xb7f35240, imageRep=0x8266d54, aRect=...) at NSImage.m:795
#17 0xb7cd6fc7 in -[NSImage lockFocusOnRepresentation:] (self=0x8268b4c, 
---Type <return> to continue, or q <return> to quit---
    _cmd=0xb7f351f8, imageRep=0x826e0ac) at NSImage.m:1018
#18 0xb7cd7ddc in -[NSImage(Private) _doImageCache:] (self=0x8268b4c, 
    _cmd=0xb7f351e0, rep=0x8266d54) at NSImage.m:2064
#19 0xb7cd6b94 in -[NSImage drawInRect:fromRect:operation:fraction:respectFlipped:hints:] (self=0x8268b4c, _cmd=0xb7f09f18, dstRect=..., srcRect=..., 
    op=NSCompositeSourceOver, delta=1, respectFlipped=1 '\001', hints=0x0)
    at NSImage.m:879
#20 0xb7c78919 in -[NSCell drawInteriorWithFrame:inView:] (self=0x8269764, 
    _cmd=0xb7f09f28, cellFrame=..., controlView=0x82564bc) at NSCell.m:2043
#21 0xb7c78aaa in -[NSCell drawWithFrame:inView:] (self=0x8269764, 
    _cmd=0xb7ef4160, cellFrame=..., controlView=0x82564bc) at NSCell.m:2067
#22 0xb7c3fcf5 in -[NSAppIconView drawRect:] (self=0x82564bc, _cmd=0xb7f9c0c8, 
    rect=...) at NSApplication.m:568
#23 0xb7dc2b3c in -[NSView displayRectIgnoringOpacity:inContext:] (
    self=0x82564bc, _cmd=0xb7f9c0b8, aRect=..., context=<optimized out>)
    at NSView.m:2569
#24 0xb7dc2d4d in -[NSView displayRectIgnoringOpacity:inContext:] (
    self=0x8227c24, _cmd=0xb7f9c0b8, aRect=..., context=<optimized out>)
    at NSView.m:2602
#25 0xb7db46d6 in -[NSView displayRectIgnoringOpacity:] (self=0x8227c24, 
    _cmd=0xb7f9c0a8, aRect=...) at NSView.m:2518
#26 0xb7dc1124 in -[NSView displayIfNeededInRectIgnoringOpacity:] (
    self=0x8227c24, _cmd=0xb7f9c098, aRect=...) at NSView.m:2450
---Type <return> to continue, or q <return> to quit---
#27 0xb7db4552 in -[NSView displayIfNeededInRect:] (self=0x8227c24, 
    _cmd=0xb7f9c090, aRect=...) at NSView.m:2428
#28 0xb7db4377 in -[NSView displayIfNeeded] (self=0x8227c24, _cmd=0xb7fa33d0)
    at NSView.m:2410
#29 0xb7dcc59c in -[NSWindow orderWindow:relativeTo:] (self=0x82254fc, 
    _cmd=0xb7ef40e0, place=NSWindowAbove, otherWin=-1) at NSWindow.m:1826
#30 0xb7c3f2f4 in -[NSIconWindow orderWindow:relativeTo:] (self=0x82254fc, 
    _cmd=0xb7fa3388, place=NSWindowAbove, otherWin=-1) at NSApplication.m:447
#31 0xb7dc7bf0 in -[NSWindow orderFrontRegardless] (self=0x82254fc, 
    _cmd=0xb7ef41c8) at NSWindow.m:1735
#32 0xb7c45166 in -[NSApplication(Private) _appIconInit] (self=0x8153ea4, 
    _cmd=0xb7ef4350) at NSApplication.m:3808
#33 0xb7c47b23 in -[NSApplication _init] (self=0x8153ea4, _cmd=0xb7ef4360)
    at NSApplication.m:925
#34 0xb7891f1d in -[NSObject performSelector:withObject:] (self=0x8153ea4, 
    _cmd=0xb7b42410, aSelector=0xb7ef4360, anObject=0x8153ea4)
    at NSObject.m:2019
#35 0xb78fb535 in -[NSObject(NSThreadPerformAdditions) performSelector:onThread:withObject:waitUntilDone:modes:] (self=0x8153ea4, _cmd=0xb7b424b0, 
    aSelector=0xb7ef4360, aThread=<optimized out>, anObject=0x8153ea4, 
    aFlag=1 '\001', anArray=0x8190424) at NSThread.m:1245
#36 0xb78f8e92 in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:modes:] (self=0x8153ea4, _cmd=0xb7b424b8, 
---Type <return> to continue, or q <return> to quit---
    aSelector=0xb7ef4360, anObject=0x8153ea4, aFlag=1 '\001', 
    anArray=0x8190424) at NSThread.m:1204
#37 0xb78fa831 in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:] (self=0x8153ea4, _cmd=0xb7ef4368, 
    aSelector=0xb7ef4360, anObject=0x8153ea4, aFlag=1 '\001')
    at NSThread.m:1214
#38 0xb7c462a7 in -[NSApplication init] (self=0x8153ea4, _cmd=0xb7ef40d0)
    at NSApplication.m:981
#39 0xb7c3e7a5 in +[NSApplication sharedApplication] (self=0xb7ef3a00, 
    _cmd=0x804ddc0) at NSApplication.m:851
#40 0x0804952d in main (argc=2, argv=0x0, env=0xb56cc6d0) at main.m:37
(gdb)
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