Now I understand what Bruce was getting at - -1 can be parsed as two

tokens, so it does indeed need to be parenthesized.  Duh.  Sometimes
it can stare you right and the face and you still don't see it.  Thanks, bde.

include/fnmatch.h

@@ -46,7 +46,7 @@
 #define	FNM_PERIOD	0x04	/* Period must be matched by period. */
 
 #if __XSI_VISIBLE
-#define	FNM_NOSYS	-1	/* Reserved. */
+#define	FNM_NOSYS	(-1)	/* Reserved. */
 #endif
 
 #if __BSD_VISIBLE

include/regex.h

@@ -75,7 +75,7 @@ typedef struct {
 #define	REG_DUMP	0200
 
 /* regerror() flags */
-#define	REG_ENOSYS	-1
+#define	REG_ENOSYS	(-1)
 #define	REG_NOMATCH	 1
 #define	REG_BADPAT	 2
 #define	REG_ECOLLATE	 3