asking for help: how to compile doc-lilo ?

hi all,

i download source code of lilo( in doc-linux-5.0.0.tar.gz) , modify the
Makefile
according to lilo-0.21-doc.patch, and then key in 'make' to compile a
doc-lilo
binary which is normally located in /sbin, but failed to do so with a
prompt
"make: *** [doc.b] Error1" .that is my perplexity.
thanks
yang