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~ !!