I'm trying to update my mud_prog.c file and I'm getting a few errors.

mud_prog.c:331: undefined reference to `format'
mud_prog.c:331: undefined reference to `mudstrlcat'
mud_prog.c:333: undefined reference to `format'
/mud_prog.c:333: undefined reference to `mudstrlcat'
/mud_prog.c:337: undefined reference to `format'
/mud_prog.c:339: undefined reference to `format'
/mud_prog.c:342: undefined reference to `mudstrlcat'
mud_prog.c:346: undefined reference to `format'
mud_prog.c:346: undefined reference to `mudstrlcat'

I understand that this means format and mudstrlcat are not defined

I've been looking through 6dragons and I can't seem to find where it is defined as a reference

anybody mind pointing me in the right direction?

grep is your friend. If you have ctags installed, it makes it even easier, since smart editors (like vim) allow you to jump directly to a function's definition if a tag entry exists for it.

If you copied code from elsewhere, you probably didn't copy the functions format and mudstrlcat. If this "6dragons" thing was based on a late enough SmaugFUSS, they'd be defined in there somewhere.