Instructions to install Scons for Symbian
At least SCons 0.98.5 did not install properly so you most likely need to copy the SCons folder from:
After that you should have SCons folder under site-packages. Also remember to check that you have Python25\Scripts folder in your PATH.
SCons warns you about it: parallel (-j) builds may not work reliably with open Python files. Install page:
And you should be good to go.
Even though PKG generation support is implemented, SIS files can also be created with Ensymble. It can be a handy utility for various other tasks too. Get the source package, DO NOT get a pre-squeezed version.