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	diff --git a/mpi/generic/mpi-asm-defs.h b/mpi/generic/mpi-asm-defs.h
	index 13424e28..e607806e 100644
	--- a/mpi/generic/mpi-asm-defs.h
	+++ b/mpi/generic/mpi-asm-defs.h
	@@ -1,10 +1,8 @@
	-/* This file defines some basic constants for the MPI machinery. We
	- * need to define the types on a per-CPU basis, so it is done with
	- * this file here. */
	+/* This file defines some basic constants for the MPI machinery.
	+ * AMD64 compiled for the x32 ABI is special and thus we can't use the
	+ * standard values for this ABI. */
	+#if __GNUC__ >= 3 && defined(__x86_64__) && defined(__ILP32__)
	+#define BYTES_PER_MPI_LIMB 8
	+#else
	#define BYTES_PER_MPI_LIMB (SIZEOF_UNSIGNED_LONG)
	-
	-
	-
	-
	-
	-
	+#endif