Hi, > Make[1]: *** No rule to make target '/usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/include/stddef.h', needed by 'img2srec.o'. Stop. img2srec is a utility for host machine. Host gcc compiler is used to compile it. On cygwin no stddef.h exists. That is why you got the message. Regards, Sangmoon Kim