-#CFLAGS+= -Wshadow -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -Wmissing-declarations
-#CFLAGS+= -Wmissing-prototypes -Wredundant-decls -Wnested-externs -Winline
+CFLAGS+= -Wshadow -Werror=pointer-arith -Werror=write-strings
+CFLAGS+= -Werror=strict-prototypes -Werror=missing-parameter-type
+CFLAGS+= -Werror=redundant-decls -Werror=nested-externs -Winline
+CFLAGS+= -Werror=undef