Type scons --sconstruct SConstruct-noinkscape in the command line if you don't have Inkscape all set up to work on the command line.
If you do, scons should work.
Use scons continuous to have continuous building after installing inotify.
If you have Inkscape v1.0 and do want to run Inkscape, use
inkscape = Builder(action = 'inkscape --export-type=pdf --export-filename=$TARGET $SOURCE')