define default values, if they aren't already defined

--- a/news.h
+++ b/news.h
@@ -10,7 +10,17 @@
  * $Date: 1995/07/06 08:40:45 $
  */
 
-#define DEF_PAGER       "more"
+#define VERSION		"0.9"
+
+#ifndef NEWSDIR
+  #define NEWSDIR      "/var/lib/sysnews"
+#endif
+#ifndef NEWSTIME
+  #define NEWSTIME     ".news_time"
+#endif
+#ifndef DEF_PAGER
+  #define DEF_PAGER       "pager"
+#endif
 #define NOEXPFILE       ".noexpire"
 #define DATEFORMAT      "(%b %d %Y)"
 #define ERRMSG          strerror(errno)
