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