BOOTSTRAP_PROFILE = build
-BOOTSTRAP_MCS = MONO_PATH="$(topdir)/class/lib/$(BOOTSTRAP_PROFILE)$(PLATFORM_PATH_SEPARATOR)$$MONO_PATH" $(INTERNAL_GMCS)
-MCS = MONO_PATH="$(topdir)/class/lib/$(BOOTSTRAP_PROFILE)$(PLATFORM_PATH_SEPARATOR)$$MONO_PATH" $(INTERNAL_GMCS)
+# Using CSC_SDK_PATH_DISABLED for sanity check that all references have path specified
+
+BOOTSTRAP_MCS = MONO_PATH="$(topdir)/class/lib/$(BOOTSTRAP_PROFILE)$(PLATFORM_PATH_SEPARATOR)$$MONO_PATH" CSC_SDK_PATH_DISABLED= $(INTERNAL_CSC)
+MCS = $(BOOTSTRAP_MCS)
# nuttzing!