Installing and using pdfdiff.py

The pdfdiff.py script is hosted at Oxford:

http://www.cs.ox.ac.uk/people/cas.cremers/misc/pdfdiff.html

The page there gives install instructions.

You'll need the xpdf tools. Prebuilt binaries are available for the three major operating systems:

http://www.foolabs.com/xpdf/download.html

Download xpdfbin-mac-3.04.tar.gz and double click the to untar.

Inside the resulting xpdfbin-mac-3.04 folder there will be no package installer. Instead there are just two different folders that house a collection of binaries: bin32 and bin64. Modern MacBooks are probably 64-bit. The INSTALL file explains how to copy the binary files, man files and example file.