--- c.m4.~1.179.~	2003-05-24 07:07:17.000000000 +1000
+++ c.m4	2003-06-07 11:45:52.000000000 +1000
@@ -805,6 +805,16 @@
   va_end (v);
   return s;
 }
+
+/* OSF 4.0 Compaq C is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not '\xHH' hex character constants.
+   These don't provoke an error unfortunately, instead are silently treated
+   as 'x'.  The following induces an error for this, until -std1 is added to
+   put it in proper ANSI mode.  Curiously '\x00'!='x' comes out true, it's
+   necessary to write '\x00'==0 to induce a problem, for an array size at
+   least.  */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
 int test (int i, double x);
 struct s1 {int (*f) (int a);};
 struct s2 {int (*f) (double a);};