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-rw-r--r--src/sim/syscall_emul.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index ceeacd39b..5ba487c7c 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -116,6 +116,10 @@
#include "sim/syscall_emul_buf.hh"
#include "sim/syscall_return.hh"
+#if defined(__APPLE__) && defined(__MACH__) && !defined(CMSG_ALIGN)
+#define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1))
+#endif
+
//////////////////////////////////////////////////////////////////////
//
// The following emulation functions are generic enough that they