Looking at its Makefile, I see: ifneq ($(CONFIG_USE_MUSL),) MAKE_FLAGS += FTS_LDLIBS=-lfts TARGET_CFLAGS += -D_LARGEFILE64_SOURCE endif Anyone know why -D_LARGEFILE64_SOURCE isn't invariant? Why just with MUSL? Also, it doesn't seem that this package has a direct dependency on libfts... though it uses libselinux which does.