Index: /trunk/src/VBox/Runtime/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Runtime/Makefile.kmk	(revision 81274)
+++ /trunk/src/VBox/Runtime/Makefile.kmk	(revision 81275)
@@ -3133,4 +3133,7 @@
 	r0drv/memobj-r0drv.cpp \
 	r0drv/powernotification-r0drv.c
+# - The xnu memcpy implementation in osfmk/x86_64/bcopy.s returns 'void' rather than 'void *', so use our own.
+RuntimeR0Drv_SOURCES.darwin.amd64 = \
+	common/string/memcpy.asm \
 
 RuntimeR0Drv_SOURCES.os2 = \