Added a few ids to stop weirdly-named web pages being built for sections
without ids.
</Sect1>
-<Sect1>
+<Sect1 id="sec-build-checks">
<Title>Things to check before you start typing</Title>
<Para>
</Sect1>
-<Sect1>
+<Sect1 id="sec-makefile-arch">
<Title>The <Filename>Makefile</Filename> architecture
<IndexTerm><Primary>makefile architecture</Primary></IndexTerm></Title>