+ (unset SDKROOT; \
+ $(MAKE) -C BuildTools \
+ BUILD_DIRS_ONLY=1 \
+ UNIVERSAL= \
+ TARGET_NATIVE_ARCH="$(TARGET_NATIVE_ARCH)" \
+ TARGETS_TO_BUILD="$(TARGETS_TO_BUILD)" \
+ ENABLE_OPTIMIZED=$(ENABLE_OPTIMIZED) \
+ ENABLE_PROFILING=$(ENABLE_PROFILING) \
+ ENABLE_COVERAGE=$(ENABLE_COVERAGE) \
+ DISABLE_ASSERTIONS=$(DISABLE_ASSERTIONS) \
+ ENABLE_EXPENSIVE_CHECKS=$(ENABLE_EXPENSIVE_CHECKS) \
+ ENABLE_LIBCPP=$(ENABLE_LIBCPP) \
+ CFLAGS= \
+ CXXFLAGS= \
+ ) || exit 1;