--- glibc-2.16.0/rt/Makefile.orig	2012-06-30 23:12:34.000000000 +0400
+++ glibc-2.16.0/rt/Makefile	2012-07-03 15:09:01.696678685 +0400
@@ -78,3 +78,13 @@
 endif
 
 tst-mqueue7-ARGS = -- $(built-program-cmd)
+
+# XXX avoid timing issues on fine-grained SMT systems
+ifeq (powerpc, $(base-machine))
+no-parallel-testing = yes
+endif
+ifneq ($(filter %tests,$(MAKECMDGOALS)),)
+ifeq ($(no-parallel-testing),yes)
+.NOTPARALLEL:
+endif
+endif