Default Xcode Project Does Not Compile under Xcode 9.4.1

[TroikaTronix]

Attempting to compile Xcode project in Xcode 9.4.1 fails, as it does not find the header files for squish and snappy because the include files for squish and snappy are not copied to the $(BUILT_PRODUCTS_DIR).

#include <squish.h> (in squish-c.cpp) -- FAIL
#include <snappy-c.h> (in hap.c)) -- FAIL

The following changes to the include path allows the project to compile.

change
"$(BUILT_PRODUCTS_DIR)/include/snappy"
to
$(PROJECT_DIR)/external/snappy/snappy-mac/build/$(CONFIGURATION)/include/snappy

change
"$(BUILT_PRODUCTS_DIR)/include/squish"
to
$(PROJECT_DIR)/external/squish/build/$(CONFIGURATION)/include/squish

Am I missing something? Does this project require a new version of Xcode?