This page should contain questions and links to answers of frequently asked questions.
Why can't I run a command in SCons that my shell can find?
SCons doesn't import your shell's environment by default. This is easy to do if you want. See here: ImportingEnvironmentSettings.
Parallel Builds
How do I prevent parallel builds? In particular, how do I prevent the commands from a given builder being executed in parallel? /PreventingParallelBuilds