I was tracking down this error:

OSGeo/gdal#11786

That led me to try to build node-mapnik with npm, but got:

npm ERR! /bin/sh: 1: mapnik-config: not found
npm ERR! gyp: Call to 'mapnik-config --cflags' returned exit status 127 while in binding.gyp. while trying to load binding.gyp
npm ERR! gyp ERR! configure error

Debian sid/unstable does not have the mapnik-config binary, but pkg-config should be used instead. For more information, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1095136