* ltdl.m4 (AC_CHECK_TYPES):  This macro was introduced in Autoconf
2.5x.  Backported a fallback implementation (directly to ltdl.m4)
from Autoconf 2.50, so that we can still bootstrap with Autoconf
2.13.

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 5847353..7599f56 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2001-09-03  Gary V. Vaughan  <gary@gnu.org>
 
+	* ltdl.m4 (AC_CHECK_TYPES):  This macro was introduced in Autoconf
+	2.5x.  Backported a fallback implementation (directly to ltdl.m4)
+	from Autoconf 2.50, so that we can still bootstrap with Autoconf
+	2.13.
+
 	From Marius Vollmer <mvo@zagadka.ping.de>:
 	* libltdl/ltdl.c (tryall_dlopen_module): Don't forget to propogate
 	errors over recurse levels.

ltdl.m4

diff --git a/ltdl.m4 b/ltdl.m4
index 0038be2..75be472 100644
--- a/ltdl.m4
+++ b/ltdl.m4
@@ -285,6 +285,28 @@
 ])# AC_LTDL_DLSYM_USCORE
 
 
+# AC_CHECK_TYPES(TYPES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#                [INCLUDES])
+# ---------------------------------------------------------------
+# This macro did not exist in Autoconf 2.13, which we do still support
+ifdef([AC_CHECK_TYPES], [],
+[define([AC_CHECK_TYPES],
+  [AC_CACHE_CHECK([for $1], ac_Type,
+    [AC_TRY_LINK([$4],
+	[if (($1 *) 0)
+	  return 0;
+	if (sizeof ($1))
+	  return 0;],
+	[ac_Type=yes],
+	[ac_Type=no])])
+  if test "x$ac_Type" = xyes; then
+    ifelse([$2], [], [:], [$2])
+  else
+    ifelse([$3], [], [:], [$3])
+  fi])
+])# AC_CHECK_TYPES
+
+
 # AC_LTDL_FUNC_ARGZ
 # -----------------
 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
@@ -293,7 +315,7 @@
 AC_CHECK_TYPES([error_t],
   [],
   [AC_DEFINE([error_t], [int],
-    [Define to a type to use for `error_t' if it is not otherwise available.])],
+    [Define to a type to use for \`error_t' if it is not otherwise available.])],
   [#if HAVE_ARGZ_H
 #  include <argz.h>
 #endif])