Clean up directory to compile and run on my Linux box at least.

Note that there is some trouble with inconsistant input/output formats.

contrib/bit/varbit.h

@@ -1,5 +1,26 @@
-#include "c.h"
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <float.h>                              /* faked on sunos4 */
+
+#include <math.h>
+
 #include "postgres.h"
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#ifndef MAXINT
+#define MAXINT            INT_MAX
+#endif
+#else
+#ifdef HAVE_VALUES_H
+#include <values.h>
+#endif
+#endif
+#include "fmgr.h"
+#include "utils/timestamp.h"
+#include "utils/builtins.h"
+
 
 #define HEXDIG(z)    (z)<10 ? ((z)+'0') : ((z)-10+'A')