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Fix "error: unknown type name 'cpu_set_t'".  Patch submitted upstream
http://lists.mcs.anl.gov/pipermail/petsc-dev/2014-May/015345.html

--- a/src/sys/threadcomm/impls/openmp/tcopenmp.c	2014-03-13 21:47:22.000000000 -0500
+++ b/src/sys/threadcomm/impls/openmp/tcopenmp.c	2014-04-02 14:44:57.185170151 -0500
@@ -1,6 +1,9 @@
 #define PETSC_DESIRE_FEATURE_TEST_MACROS
 #include <../src/sys/threadcomm/impls/openmp/tcopenmpimpl.h>
 #include <omp.h>
+#if defined(PETSC_HAVE_SCHED_CPU_SET_T)
+#include <sched.h>
+#endif
 
 PetscErrorCode PetscThreadCommGetRank_OpenMP(PetscInt *trank)
 {