DOCBoot doesn't compile

[Brian O'Dell]

I get the following error when compiling DOCBoot :

doc_bootstub.o(.text+0x131): In function `doc_cmd':
: undefined reference to `BX_CDSN_IO'

I have googled and grepped for BX_CDSN_IO with no results.  Any 
thoughts?  Has anyone successfully compiled the most recent docboot?

Thanks,
Brian