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gawk: Extension Version String

 
 16.4.5.3 Registering An Extension Version String
 ................................................
 
 You can register a version string that indicates the name and version of
 your extension with 'gawk', as follows:
 
 'void register_ext_version(const char *version);'
      Register the string pointed to by 'version' with 'gawk'.  Note that
      'gawk' does _not_ copy the 'version' string, so it should not be
      changed.
 
    'gawk' prints all registered extension version strings when it is
 invoked with the '--version' option.
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