On systems with little ram (2G in my case) the pixbuf-scale test will either
freeze the system of cause excessive swapping without the test every completing.

* gnu/packages/gtk.scm (gdk-pixbuf): Don't run 'pixbuf-scale' test.
---
 gnu/packages/gtk.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/gtk.scm b/gnu/packages/gtk.scm
index 916873b..021ee00 100644
--- a/gnu/packages/gtk.scm
+++ b/gnu/packages/gtk.scm
@@ -8,6 +8,7 @@
 ;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com>
 ;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
 ;;; Copyright © 2015 David Hashe <david.hashe@dhashe.com>
+;;; Copyright © 2016 Jookia <166291@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -407,6 +408,8 @@ highlighting and other features typical of a source code editor.")
              ;; SKIP Not enough memory to load bitmap image
              ;; ERROR: cve-2015-4491 - too few tests run (expected 4, got 2)
              (("cve-2015-4491\\$\\(EXEEXT\\) ") "")
+             ;; XXX FIXME: This test can crash systems with little RAM.
+             (("pixbuf-scale\\$\\(EXEEXT\\) ") "")
              ;; XXX FIXME: This test fails with:
              ;; ERROR:pixbuf-jpeg.c:74:test_type9_rotation_exif_tag:
              ;; assertion failed (error == NULL): Data differ
-- 
2.7.0