diff --git a/util/alloca.c b/util/alloca.c
index 02899b8..396fb21 100644
--- a/util/alloca.c
+++ b/util/alloca.c
@@ -1,10 +1,38 @@
-/* Check if the system's alloca() function actually extends the stack.
- * If it doesn't, it's not usable for Elk.
+/* alloca.c: Check if the system's alloca() function actually extends the
+ * stack. If it doesn't, it's not usable for Elk.
  *
  * The second value printed should be about 100 larger (or smaller,
  * depending on the stack growing direction) than the first value.
  *
- * On some systems you may have to enable the #include and delete the line
+ * $Id$
+ *
+ * Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
+ * Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
+ *
+ * This software was derived from Elk 1.2, which was Copyright 1987, 1988,
+ * 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
+ * by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
+ * between TELES and Nixdorf Microprocessor Engineering, Berlin).
+ *
+ * Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
+ * owners or individual owners of copyright in this software, grant to any
+ * person or company a worldwide, royalty free, license to
+ *
+ *    i) copy this software,
+ *   ii) prepare derivative works based on this software,
+ *  iii) distribute copies of this software or derivative works,
+ *   iv) perform this software, or
+ *    v) display this software,
+ *
+ * provided that this notice is not removed and that neither Oliver Laumann
+ * nor Teles nor Nixdorf are deemed to have made any representations as to
+ * the suitability of this software for any purpose nor are held responsible
+ * for any defects of this software.
+ *
+ * THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
+ */
+
+/* On some systems you may have to enable the #include and delete the line
  * declaring alloca().
  */
 
@@ -14,13 +42,13 @@ extern char *alloca();
 
 char *stkbase;
 
-prstk(s) char *s; {
+prstk(char *s) {
     char foo;
 
     printf("stack %s calling alloca(100): %lu\n", s, (long)(stkbase - &foo));
 }
-    
-main(ac, av) char **av; {
+
+main(int ac, **av) {
     char *foo;
 
     stkbase = (char *)&foo;