The AC_OUTPUT Macro
Finally, we come to the AC_OUTPUT macro, which expands, within configure, into shell code that generates the config.status script based on the data specified in the previous macro expansions. All other macros must be used before AC_OUTPUT is expanded, or they will be of little value to your generated configure script. (Additional shell script may be placed in configure.ac after AC_OUTPUT, but it will not affect the configuration or file generation performed by config.status.)
Consider adding shell echo or print statements after AC_OUTPUT to tell the user how the build system is configured based on the specified command-line options. You can also use these statements to tell the user about additional useful targets for make
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