thanks for your help! I got the objects compiled and loaded. it's been about two weeks so I'm a little fuzzy on what might have gone wrong before, but I modified a few file names & this is the makefile I ended up with:

# Makefile for mylib

lib.name = grambi~

class.sources = grambidec~.c grambiman~.c grambipan~.c

datafiles = grambilib-help.pd readme.md

include Makefile.pdlibbuilder

thanks again~ !!