Fix strerror() handling for systems which set ANSI_STRING.

Don't print errors if "include" is specified with no arguments.
New test suite for the $(shell ...) function.

1 files changed, 4 insertions, 5 deletions

diff --git a/make.h b/make.h
index 55682d8..b772d77 100644
--- a/make.h
+++ b/make.h
@@ -276,16 +276,15 @@ extern void bzero PARAMS ((char *, int));
 extern void bcopy PARAMS ((const char *b1, char *b2, int));
 # endif
 
-#endif  /* ANSI_STRING.  */
-#undef  ANSI_STRING
-
 /* SCO Xenix has a buggy macro definition in <string.h>.  */
 #undef  strerror
-
-#if !defined(ANSI_STRING) && !defined(__DECC)
+#if !defined(__DECC)
 extern char *strerror PARAMS ((int errnum));
 #endif
 
+#endif  /* !ANSI_STRING.  */
+#undef  ANSI_STRING
+
 #if HAVE_INTTYPES_H
 # include <inttypes.h>
 #endif