This is a MapQuest style written in CartoCSS, making use of vector tiles
Open up the source and change the source URI from tmsource:///home/pnorman/mq-carto-style-vector/mq-carto-style.tm2source
to a local path.
sed -i 's|/home/pnorman/mq-carto-style-vector/|/my/path/to/the/style/|g' mq-carto-style.tm2/project.yml
sed -i 's|/home/pnorman/mq-carto-style-vector/|/my/path/to/the/style/|g' mq-carto-style.tm2/project.xml
Set PGDATABASE
and other variables before launching MapBox Studio, e.g. export PGDATABASE=MnPADB; npm start