Fix typo.

Change-Id: Iabdc6ec1ead4f37294f01ebebc1e71e188455533
diff --git a/core/definitions.mk b/core/definitions.mk
index 28ac0bc..47c0f9f3 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -775,7 +775,7 @@
   $(foreach inc,$(PRIVATE_RS_INCLUDES),$(addprefix -I , $(inc))) \
   $(PRIVATE_RS_SOURCE_FILES)
 $(hide) $(LLVM_RS_LINK) \
-  $(PRIVATE_RS_OUTPUR_DIR)/res/raw/*.bc
+  $(PRIVATE_RS_OUTPUT_DIR)/res/raw/*.bc
 $(hide) mkdir -p $(dir $@)
 $(hide) touch $@
 endef