Index: /trunk/ccl/lisp-kernel/lisptypes.h
===================================================================
--- /trunk/ccl/lisp-kernel/lisptypes.h	(revision 4977)
+++ /trunk/ccl/lisp-kernel/lisptypes.h	(revision 4978)
@@ -70,4 +70,5 @@
 /* Broken <i386/ucontext.h> in xcode 2.4 */
 #include <sys/ucontext.h>
+#ifndef _MCONTEXT64_T /* A guess at what'll be defined when this is fixed */
 struct mcontext64 {
 	x86_exception_state64_t	es;
@@ -75,4 +76,5 @@
 	x86_float_state64_t	fs;
 };
+#endif
 #endif
 #else