diff --git a/gfx/cairo/cairo/src/cairo-quartz-surface.c b/gfx/cairo/cairo/src/cairo-quartz-surface.c
--- a/gfx/cairo/cairo/src/cairo-quartz-surface.c
+++ b/gfx/cairo/cairo/src/cairo-quartz-surface.c
@@ -128,20 +128,22 @@ CG_EXTERN CGImageRef CGBitmapContextCrea
  */
 static void (*CGContextClipToMaskPtr) (CGContextRef, CGRect, CGImageRef) = NULL;
 static void (*CGContextDrawTiledImagePtr) (CGContextRef, CGRect, CGImageRef) = NULL;
 static unsigned int (*CGContextGetTypePtr) (CGContextRef) = NULL;
 static void (*CGContextSetShouldAntialiasFontsPtr) (CGContextRef, bool) = NULL;
 static void (*CGContextSetAllowsFontSmoothingPtr) (CGContextRef, bool) = NULL;
 static bool (*CGContextGetAllowsFontSmoothingPtr) (CGContextRef) = NULL;
 static CGPathRef (*CGContextCopyPathPtr) (CGContextRef) = NULL;
 static CGFloat (*CGContextGetAlphaPtr) (CGContextRef) = NULL;
 
+static SInt32 _cairo_quartz_osx_version = 0x0;
+
 static cairo_bool_t _cairo_quartz_symbol_lookup_done = FALSE;
 
 /*
  * Utility functions
  */
 
 #ifdef QUARTZ_DEBUG
 static void quartz_surface_to_png (cairo_quartz_surface_t *nq, char *dest);
 static void quartz_image_to_png (CGImageRef, char *dest);
 #endif
@@ -163,20 +165,25 @@ static void quartz_ensure_symbols(void)
 
     CGContextClipToMaskPtr = dlsym(RTLD_DEFAULT, "CGContextClipToMask");
     CGContextDrawTiledImagePtr = dlsym(RTLD_DEFAULT, "CGContextDrawTiledImage");
     CGContextGetTypePtr = dlsym(RTLD_DEFAULT, "CGContextGetType");
     CGContextSetShouldAntialiasFontsPtr = dlsym(RTLD_DEFAULT, "CGContextSetShouldAntialiasFonts");
     CGContextCopyPathPtr = dlsym(RTLD_DEFAULT, "CGContextCopyPath");
     CGContextGetAllowsFontSmoothingPtr = dlsym(RTLD_DEFAULT, "CGContextGetAllowsFontSmoothing");
     CGContextSetAllowsFontSmoothingPtr = dlsym(RTLD_DEFAULT, "CGContextSetAllowsFontSmoothing");
     CGContextGetAlphaPtr = dlsym(RTLD_DEFAULT, "CGContextGetAlpha");
 
+    if (Gestalt(gestaltSystemVersion, &_cairo_quartz_osx_version) != noErr) {
+        // assume 10.5
+        _cairo_quartz_osx_version = 0x1050;
+    }
+
     _cairo_quartz_symbol_lookup_done = TRUE;
 }
 
 CGImageRef
 _cairo_quartz_create_cgimage (cairo_format_t format,
 			      unsigned int width,
 			      unsigned int height,
 			      unsigned int stride,
 			      void *data,
 			      cairo_bool_t interpolate,
@@ -3028,22 +3035,25 @@ static cairo_int_status_t
 	CGContextSetAlpha (surface->cgContext, solid_mask->color.alpha);
 	rv = _cairo_quartz_surface_paint_cg (surface, op, source, clip);
 	CGContextSetAlpha (surface->cgContext, 1.0);
 
 	return rv;
     }
 
     /* If we have CGContextClipToMask, we can do more complex masks */
     if (CGContextClipToMaskPtr) {
 	/* For these, we can skip creating a temporary surface, since we already have one */
-	if (mask->type == CAIRO_PATTERN_TYPE_SURFACE && mask->extend == CAIRO_EXTEND_NONE)
+	/* For some reason this doesn't work reliably on OS X 10.5.  See bug 721663. */
+	if (_cairo_quartz_osx_version >= 0x1060 && mask->type == CAIRO_PATTERN_TYPE_SURFACE &&
+	    mask->extend == CAIRO_EXTEND_NONE) {
 	    return _cairo_quartz_surface_mask_with_surface (surface, op, source, (cairo_surface_pattern_t *) mask, clip);
+	}
 
 	return _cairo_quartz_surface_mask_with_generic (surface, op, source, mask, clip);
     }
 
     /* So, CGContextClipToMask is not present in 10.3.9, so we're
      * doomed; if we have imageData, we can do fallback, otherwise
      * just pretend success.
      */
     if (surface->imageData)
 	return CAIRO_INT_STATUS_UNSUPPORTED;