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diff --git a/m4/realloc.m4 b/m4/realloc.m4
deleted file mode 100644
index 4ff1d26b..00000000
--- a/m4/realloc.m4
+++ /dev/null
@@ -1,42 +0,0 @@
-#serial 1
-
-dnl From Jim Meyering.
-dnl Determine whether realloc works when both arguments are 0.
-dnl If it doesn't, arrange to use the replacement function.
-dnl
-dnl If you use this macro in a package, you should
-dnl add the following two lines to acconfig.h:
-dnl  /* Define to rpl_realloc if the replacement function should be used.  */
-dnl  #undef realloc
-dnl
-
-AC_DEFUN([jm_FUNC_REALLOC],
-[
- if test x = y; then
-   dnl This code is deliberately never run via ./configure.
-   dnl FIXME: this is a gross hack to make autoheader put an entry
-   dnl for this symbol in config.h.in.
-   AC_CHECK_FUNCS(DONE_WORKING_REALLOC_CHECK)
- fi
- dnl xmalloc.c requires that this symbol be defined so it doesn't
- dnl mistakenly use a broken realloc -- as it might if this test were omitted.
- AC_DEFINE(HAVE_DONE_WORKING_REALLOC_CHECK, 1, [Needed for xmalloc.c])
-
- AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
-  [AC_RUN_IFELSE([AC_LANG_SOURCE([
-    char *realloc ();
-    int
-    main ()
-    {
-      exit (realloc (0, 0) ? 0 : 1);
-    }
-   ])],
-   [jm_cv_func_working_realloc=yes],
-   [jm_cv_func_working_realloc=no],
-   [When crosscompiling])
-  ])
-  if test $jm_cv_func_working_realloc = no; then
-    AC_LIBOBJ([realloc])
-    AC_DEFINE(realloc, rpl_realloc, [Replacement realloc()])
-  fi
-])