argp_help if the ARGP_HELP_BUG_ADDR flag is set (as it is by various
standard help messages), embedded in a sentence that says something like
`Report bugs to ADDR.'. */
-__const extern char *argp_program_bug_address;
+extern __const char *argp_program_bug_address;
/* The exit status that argp will use when exiting due to a parsing error.
If not defined or set by the user program, this defaults to EX_USAGE from