Include ctype.h for isspace()

src/sbbs3/wordwrap.c

@@ -31,6 +31,7 @@
  * Note: If this box doesn't appear square, then you need to fix your tabs.	*
  ****************************************************************************/
 
+#include <ctype.h>
 #include <genwrap.h>
 #include <stdlib.h>		/* realloc */
 #include "wordwrap.h"