Ah. I should have mentioned that as well. When setting up the first time, in addition to running check_modules.pl one should also tex the check_latex.tex file in webwork2/bin
pdflatex check_latex.tex
If there are no fatal error messages then all of the tex files needed have been located. (Unfortunately I haven't yet figured out how to run latex automatically and have the error log piped back through STDOUT so this is currently a separate check in addition to check_modules.pl
Installation
No Such file or directory - ImageGenerator.pm
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