__GETOPT_XCONCAT   37 maint/gnulib/lib/getopt-pfx-core.h #  define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
__GETOPT_XCONCAT   37 maint/gnulib/lib/getopt-pfx-ext.h #  define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)