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15.1 Controlling Help Output

Users consult ‘configure --help’ to learn of configuration decisions specific to your package. By default, configure breaks this output into sections for each type of option; within each section, help strings appear in the order configure.ac defines them: 

     Optional Features:
       ...
       --enable-bar            include bar
     
     Optional Packages:
       ...
       --with-foo              use foo
— Macro: AC_PRESERVE_HELP_ORDER

Request an alternate --help format, in which options of all types appear together, in the order defined. Call this macro before any AC_ARG_ENABLE or AC_ARG_WITH. 

          Optional Features and Packages:
            ...
            --enable-bar            include bar
            --with-foo              use foo