I cloned the repository and ran build_chapters. It failed with the included message.
OS is Snow Leopard, details:
Darwin Finarfin.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386
This is perl, v5.10.1 (*) built for darwin-2level
vlion$ perl build/tools/build_chapters.pl
Unknown section 'scoping' in 'sections/chapter_07.pod'
You can replace "scoping" with "scope" on file chapter_07.pod and it will work.