Index: lldb/packages/Python/lldbsuite/test/make/Makefile.rules
===================================================================
--- lldb/packages/Python/lldbsuite/test/make/Makefile.rules
+++ lldb/packages/Python/lldbsuite/test/make/Makefile.rules
@@ -140,7 +140,10 @@
 			SDKROOT := $(shell xcrun --sdk $(SDK_NAME) --show-sdk-path)
 		endif
 		ifeq "$(TRIPLE_VERSION)" ""
-			TRIPLE_VERSION := $(shell echo $(notdir $(SDKROOT)) | grep -E -o -e '[0-9]+\.[0-9]')
+			ifeq "$(SDK_NAME)" ""
+                               $(error "SDK_NAME is empty")
+			endif
+			TRIPLE_VERSION := $(shell xcrun --sdk $(SDK_NAME) --show-sdk-version)
 		endif
 		ifeq "$(TRIPLE_ENV)" "simulator"
 			ARCH_CFLAGS := -m$(TRIPLE_OS)-simulator-version-min=$(TRIPLE_VERSION)