Porting to i686-msdosdjgpp

[gnufan42]

Hi,
        I'm trying to port openjdk 8 to DOS. I use cygwin as compilation 
environment and use djgpp-gcc for the compiler. I have just got started and now 
I'm recompiling some dependency libraries. Can anybody give me some suggestion 
about what I'm trying to do?
Thanks,
Gnufan