autoconf: Help Formatting

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1 15.1 Controlling Help Output
1 ============================
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1 Users consult `configure --help' to learn of configuration decisions
1 specific to your package.  By default, `configure' breaks this output
1 into sections for each type of option; within each section, help
1 strings appear in the order `configure.ac' defines them:
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1      Optional Features:
1        ...
1        --enable-bar            include bar
1 
1      Optional Packages:
1        ...
1        --with-foo              use foo
1 
1  -- Macro: AC_PRESERVE_HELP_ORDER
1      Request an alternate `--help' format, in which options of all
1      types appear together, in the order defined.  Call this macro
1      before any `AC_ARG_ENABLE' or `AC_ARG_WITH'.
1 
1           Optional Features and Packages:
1             ...
1             --enable-bar            include bar
1             --with-foo              use foo
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