--- compile.c.orig	2011-10-27 02:37:57 +0000
+++ compile.c	2011-10-27 02:40:25 +0000
@@ -17,6 +17,9 @@
 #include "insns.inc"
 #include "insns_info.inc"
 
+/* Tru64 headers #define leave in <c_excpt.h> */
+#undef leave
+
 #define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
 #define FIXNUM_INC(n, i) ((n)+(INT2FIX(i)&~FIXNUM_FLAG))
 #define FIXNUM_OR(n, i) ((n)|INT2FIX(i))
--- vm_exec.c.orig	2011-10-27 02:39:19 +0000
+++ vm_exec.c	2011-10-27 02:39:38 +0000
@@ -11,6 +11,9 @@
 
 #include <math.h>
 
+/* Tru64 headers define leave in <c_excpt.h> */
+#undef leave
+
 #if VMDEBUG > 0
 #define DECL_SC_REG(type, r, reg) register type reg_##r
 
--- thread.c.orig	2011-10-27 02:41:27 +0000
+++ thread.c	2011-10-27 02:38:53 +0000
@@ -47,6 +47,9 @@
 #include "eval_intern.h"
 #include "gc.h"
 
+/* Tru64 headers #define except in <c_excpt.h> */
+#undef except
+
 #ifndef USE_NATIVE_THREAD_PRIORITY
 #define USE_NATIVE_THREAD_PRIORITY 0
 #define RUBY_THREAD_PRIORITY_MAX 3