/usr/bin/mapnik-plugin-base is in libmapnik2-dev 2.0.0+ds1-3build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
inputdir=$(mapnik-config --input-plugins)
echo $(dirname $inputdir/../)
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