diff --git a/project/extras.mk b/project/extras.mk
index 8e2cb61..caf26a3 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,3 +1,8 @@
 CFLAGS_SHARED_ATTR	+= -DSLBT_PRE_ALPHA -DSLBT_BUILD
 CFLAGS_STATIC_ATTR	+= -DSLBT_PRE_ALPHA -DSLBT_STATIC
 CFLAGS_APP_ATTR		+= -DSLBT_APP
+
+CFLAGS_MACHINE		:= -DSLBT_MACHINE=\"$(shell $(CC) $(CFLAGS) -dumpmachine)\"
+
+src/driver/slbt_driver_ctx.o:	CFLAGS += $(CFLAGS_MACHINE)
+src/driver/slbt_driver_ctx.lo:	CFLAGS += $(CFLAGS_MACHINE)