diff -u -r ../tty-solitaire-1.1.0/Makefile ./Makefile
--- ../tty-solitaire-1.1.0/Makefile	2018-08-12 22:05:12.000000000 +0000
+++ ./Makefile	2018-08-13 20:22:37.063193979 +0000
@@ -45,7 +45,7 @@
 all: ${EXECUTABLE}
 
 ttysolitaire: $(SRC_OBJECTS)
-	$(CC) $(CFLAGS) $(SRC) -o $(EXECUTABLE) $(SRC_OBJECTS) $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(SRC) -o $(EXECUTABLE) $(SRC_OBJECTS) $(LDFLAGS)
 
 test: $(SRC_OBJECTS) $(TESTS_OBJECTS)
 	@$(CC) $(CFLAGS) $(TESTS_SRC) -o $(TESTS_EXECUTABLE) $(TESTS_OBJECTS) $(SRC_OBJECTS) $(LDFLAGS)