NOTE:
This step might not be necessary anymore. It was needed for older releases of libdream and this part of the tutorial was written when I used libdream. I would just give it a try without it.

Before being able to compile anything for the target platform Dreamcast we still have to replace one file of the official GCC for SH4 directory tree (this file is called crt0.o and handles starting and stopping your program code).

• Download the modified crt0.s here
  
  
• Copy the file somewhere in your Cygwin Tree
  
  
• Now go where the file is and use the following line:
  
  sh-elf-as -little crt0.dc.s -o /usre/local/dc/sh-elf/sh-elf/lib/ml/m4-single-only/crt0.o

Now you're ready to go !