Problems building tumble-0.33 pdf creator with netpbm instead of original pbm library

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http://www.linuxquestions.org – I would like to scan some documents and create a *.pdf file from the resulting *.tif output image files. I believe I used Eric Smith's Tumble-0.33 for this a few years ago, but can't remember how I built it. The Makefile assumes the pbm library. I believe the current version (at least with my Slackware linux 2.6) is netpbm, ie \usr\lib\netpbm\, and I'm having trouble figuring out how to modify the Makefile to use this library. The author does some stuff there that is beyond my scope. Anyone done the recently who can point me in the right direction? Thanks, Will (HowTos)