+ifeq ($(MAKECMDGOALS),install-clang)
+ DIRS := tools/clang/Driver tools/clang/lib/Headers tools/clang/tools/ccc
+ OPTIONAL_DIRS :=
+ NO_INSTALL = 1
+endif
+
+ifeq ($(MAKECMDGOALS),clang-only)
+ DIRS := $(filter-out tools runtime docs, $(DIRS)) tools/clang
+ OPTIONAL_DIRS :=
+endif
+
+ifeq ($(MAKECMDGOALS),unittests)
+ DIRS := $(filter-out tools runtime docs, $(DIRS)) utils unittests
+ OPTIONAL_DIRS :=
+endif
+
+# Don't install utils, examples, or projects they are only used to