diff --git a/lldb/packages/Python/lldbsuite/test/make/Makefile.rules b/lldb/packages/Python/lldbsuite/test/make/Makefile.rules
--- a/lldb/packages/Python/lldbsuite/test/make/Makefile.rules
+++ b/lldb/packages/Python/lldbsuite/test/make/Makefile.rules
@@ -171,15 +171,8 @@
 #   o cxx_compiler
 #   o cxx_linker
 #----------------------------------------------------------------------
-CC ?= clang
-ifeq "$(CC)" "cc"
-	ifneq "$(shell which clang)" ""
-		CC = clang
-	else ifneq "$(shell which clang-3.5)" ""
-		CC = clang-3.5
-	else ifneq "$(shell which gcc)" ""
-		CC = gcc
-	endif
+ifeq "$(CC)" ""
+$(error "C compiler is not specified. Please run tests through lldb-dotest or lit")
 endif
 
 #----------------------------------------------------------------------