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On startup Flow attempts to install using pip

Python

pip install virtualenv

virtualenv ~/.partekflow/.local

source ~/.partekflow/.local/bin/activate

(optionally add this line to a flow startup script)

pip install HTSeq==0.11.0

pip install cnvkit==0.8.5

or 

wget customer.partek.com/python-dependencies.zip

unizp -d ~/.partekflow/ python-dependencies.zip

Variant Effect Predictor

This is a compiled Perl script (so it has no direct dependency on Perl itself) we have had one report (istem.fr) of it failing to run. 

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