-# check if compiler option is supported
-cc-supports = ${shell if $(CC) ${1} -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi;}
-
-CFLAGS += -g -Wall -pipe -fno-builtin -Wstrict-prototypes -Wsign-compare \
- -Wchar-subscripts -Wmissing-declarations -Wnested-externs \
- -Wpointer-arith -Wcast-align -Wsign-compare -Wmissing-prototypes \
- -Wshadow
-CFLAGS += $(call cc-supports, -Wdeclaration-after-statement, )
-CFLAGS += -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
+CFLAGS = -g -Wall -pipe -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
+WARNINGS = -Wstrict-prototypes -Wsign-compare -Wshadow \
+ -Wchar-subscripts -Wmissing-declarations -Wnested-externs \
+ -Wpointer-arith -Wcast-align -Wsign-compare -Wmissing-prototypes
+CFLAGS += $(WARNINGS)