-DEBUG_CFLAGS ?=
-DEBUG_CFLAGS += -Wno-sign-compare -g -Wunused -Wundef
-DEBUG_CFLAGS += -Wredundant-decls
-CFLAGS ?=
-CFLAGS += -Os
-CFLAGS += -Wall
-CFLAGS += -Wuninitialized
-CFLAGS += -Wchar-subscripts
-CFLAGS += -Wformat-security
-CFLAGS += -Werror-implicit-function-declaration
-CFLAGS += -Wmissing-format-attribute
-CFLAGS += -Wunused-macros
-CFLAGS += -Wbad-function-cast
+DSS_CPPFLAGS := -DVERSION_STRING='"$(VERSION_STRING)"'
+DSS_CPPFLAGS += -Wunused-macros
+
+DSS_CFLAGS := -Wno-sign-compare -g -Wunused -Wundef
+DSS_CFLAGS += -Wredundant-decls
+DSS_CFLAGS += -Os
+DSS_CFLAGS += -Wall
+DSS_CFLAGS += -Wuninitialized
+DSS_CFLAGS += -Wchar-subscripts
+DSS_CFLAGS += -Wformat-security
+DSS_CFLAGS += -Werror-implicit-function-declaration
+DSS_CFLAGS += -Wmissing-format-attribute
+DSS_CFLAGS += -Wunused-parameter
+DSS_CFLAGS += -Wbad-function-cast
+DSS_CFLAGS += -Wshadow