Use sysconf(_SC_SYMLOOP_MAX) instead of MAXSYMLINKS. If sysconf

returns an error, fall back to MAXSYMLINKS on platforms that
define it.  Fixes build on Hurd.  Patch from Justus Winter and
Debian.

src/killall5.c

@@ -376,6 +376,19 @@ out:
 	return 0;
 }
 
+/*
+ *     Get the maximal number of symlinks to follow.
+ */
+static int maxsymlinks(void)
+{
+	int v = sysconf(_SC_SYMLOOP_MAX);
+#ifdef MAXSYMLINKS
+	if (v == -1)
+		return MAXSYMLINKS;
+#endif
+	return v;
+}
+
 /*
  *     Check path is located on a network based partition.
  */
@@ -383,7 +396,7 @@ int check4nfs(const char * path, char * real)
 {
 	char buf[PATH_MAX+1];
 	const char *curr;
-	int deep = MAXSYMLINKS;
+	int deep = maxsymlinks();
 
 	if (!nlist) return 0;