--- a/include/macros.h
+++ b/include/macros.h
@@ -192,7 +192,7 @@ extern volatile int math_error;
 #define RETURN(VALUE) {RSTSTK(); return (VALUE);}
 #endif /* TRACE_DEPTH not defined */
 
-struct descr _NORET[1];
+extern struct descr _NORET[1];
 #define NORET ((ptr_t)_NORET)
 
 /****************/
--- a/isnobol4.c
+++ b/isnobol4.c
@@ -4,6 +4,7 @@
 
 # include "mlink.h"
 # include "parms.h"
+extern struct descr _NORET[1];
 static int
 ENDALL(retval)
     ret_t retval;
--- a/main.c
+++ b/main.c
@@ -46,6 +46,7 @@ struct vars *varp;
 const char vers[] = VERSION;
 const char vdate[] = VERSION_DATE;
 const char snoname[] = "CSNOBOL4";
+struct descr _NORET[1];
 
 int
 main(argc, argv)