Using flags

[BAKERWL at UWYO.EDU]

Have not tried to implement flags before and can't get it to work.
Anyone have an idea why the following produces a segmentation fault
(core dump)?:

	struct Flag *run;

	G_gisinit(argv[0]);

	run = G_define_flag();
	run->key = 'b';
	run->description = "Run in background";
	run->answer = 'f';


	if (G_parser(argc,argv))
	   exit(-1);

	printf("%s\n",run->answer);

The core dump is from the printf statement.  It must be something
stupid I'm doing, but I can't see it...

	Bill Baker
	bakerwl at uwyo.edu