-WARNINGS = -Wall -W -Wstrict-prototypes -Wmissing-prototypes
-CFLAGS = -g -O3 -MMD -msoft-float
-ASFLAGS = -Wa,--gstabs -MMD
+DEFINES =
+WARNINGS = -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wsystem-headers
+CFLAGS = -g -msoft-float -O
+CPPFLAGS = -nostdinc -I$(SRCDIR) -I$(SRCDIR)/lib
+ASFLAGS = -Wa,--gstabs
+LDFLAGS =
+DEPS = -MMD -MF $(@:.o=.d)
+
+# Turn off -fstack-protector, which we don't support.
+ifeq ($(strip $(shell echo | $(CC) -fno-stack-protector -E - > /dev/null 2>&1; echo $$?)),0)
+CFLAGS += -fno-stack-protector
+endif
+
+# Turn off --build-id in the linker, which confuses the Pintos loader.
+ifeq ($(strip $(shell $(LD) --build-id=none -e 0 /dev/null -o /dev/null 2>&1; echo $$?)),0)
+LDFLAGS += -Wl,--build-id=none
+endif