I have a Cygwin at night, and it is installed. No idea. I found some Cygwin cross-compilation information, still didn't say something, I have to have no confidence ... I opened the cygwin directory, and I'm evangelize! The folder structure is similar to Linux, and the command also knows, try it. Write the simplest Bash. Run: Bash xxx.bat, relying on, success! Great realm, cygwin, said in the end is a tool for simulating Linux platform under Win. Hey, cool! Continue to learn ... UCLinux kernel source code download, let it run tomorrow!