diff --git a/mps/code/libcbt.c b/mps/code/libcbt.c
deleted file mode 100644
index 4c7bb3698b0..00000000000
--- a/mps/code/libcbt.c
+++ /dev/null
@@ -1,107 +0,0 @@
-/* libcbt: MPS LIBRARY CALLBACK TEST
- *
- * $Header$
- * Copyright (C) 2005 Ravenbrook Limited.  See end of file for license.
- *
- * This is a simple test of the MPS Library Callback interface
- * (mpslibcb.h). */
-
-#include "mps.h"
-#include "mpsavm.h"
-#include "mpslib.h"
-#include "mpslibcb.h"
-
-#include "testlib.h"
-#include "mpslib.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-void libcbt_assert_fail(const char *);
-mps_clock_t libcbt_clock(void);
-
-int main(int argc, char *argv[])
-{
-  int res;
-  mps_arena_t arena;
-
-  res = mps_lib_callback_register("not a callback", (void(*)(void))0);
-  if(MPS_RES_OK == res) {
-    error("mps_lib_callback_register claims to successfully register\n"
-          "an interface that does not exist.\n");
-  }
-  die(mps_lib_callback_register("mps_lib_assert_fail",
-    (void(*)(void))libcbt_assert_fail),
-    "register assert_fail");
-  /* The following functions are registered in the order that you get by
-   * providing no functions and then providing functions as they are
-   * required by assertionn failures.
-   * Interestingly, for this very simple test, only mps_clock is
-   * required. */
-  die(mps_lib_callback_register("mps_clock",
-    (mps_lib_function_t)libcbt_clock),
-    "register clock");
-  die(mps_arena_create(&arena, mps_arena_class_vm(), (size_t)1000*1000),
-    "mps_arena_create");
-
-  printf("%s: Conclusion: Failed to find any defects.\n", argv[0]);
-  return 0;
-}
-
-void libcbt_assert_fail(const char *message)
-{
-  fflush(stdout);
-  fprintf(stderr, "\nMPS ASSERTION FAILURE (TEST): %s\n", message);
-  fflush(stderr);
-  abort();
-}
-
-mps_clock_t libcbt_clock(void)
-{
-  static mps_clock_t c = 0;
-
-  ++ c;
-  return c;
-}
-
-
-/* C. COPYRIGHT AND LICENSE
- *
- * Copyright (c) 2005-2013 Ravenbrook Limited <http://www.ravenbrook.com/>.
- * All rights reserved.  This is an open source license.  Contact
- * Ravenbrook for commercial licensing options.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- * 
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 
- * 3. Redistributions in any form must be accompanied by information on how
- * to obtain complete source code for this software and any accompanying
- * software that uses this software.  The source code must either be
- * included in the distribution or be available for no more than the cost
- * of distribution plus a nominal fee, and must be freely redistributable
- * under reasonable conditions.  For an executable file, complete source
- * code means the source code for all modules it contains. It does not
- * include source code for modules or files that typically accompany the
- * major components of the operating system on which the executable file
- * runs.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */