-# try to autodetect stuff for the lazy
-ifndef ARCH
-ARCH = $(shell $(CC) -dumpmachine | awk -F- '{print $$1}')
-endif
-ifndef HAVE_NEON
-HAVE_NEON = $(shell $(CC) -E -dD - < /dev/null 2> /dev/null | grep -q __ARM_NEON__ && echo 1 || echo 0)
-endif
-ifeq ($(NO_UNDEF_CHECK)$(shell ld -v 2> /dev/null | awk '{print $$1}'),GNU)
-MAIN_LDFLAGS += -Wl,--no-undefined
+# enable large file support if available
+ifeq ($(shell $(CC) -E -dD $(CFLAGS) include/arm_features.h | grep __SIZEOF_LONG__ | awk '{print $$3}'),4)
+CFLAGS += -D_FILE_OFFSET_BITS=64