問題如下：
mipsel-linux-ld ./main.o -nodefaultlibs --script /home/user/Dingoo/lib/dingoo.xn -L/home/user/Dingoo/lib -lsmlgui -lsml -lc -lgcc -o smlgui_keyboard.elf mipsel-linux-ld: Error: unable to disambiguate: -nodefaultlibs (did you mean --nodefaultlibs ?) make[2]: *** [Makefile:52: smlgui_keyboard.elf] Error 1
解法如下：
// LD_FLAGS += -nodefaultlibs LD_FLAGS += -z nodefaultlib