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diff --git a/infrastructure/m4/vl_lib_readline.m4 b/infrastructure/m4/vl_lib_readline.m4
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+dnl @synopsis VL_LIB_READLINE([ACTION-IF-TRUE], [ACTION-IF-FALSE])
+dnl
+dnl Searches for a readline compatible library. If found, defines
+dnl `HAVE_LIBREADLINE'. If the found library has the `add_history'
+dnl function, sets also `HAVE_READLINE_HISTORY'. Also checks for the
+dnl locations of the necessary include files and sets `HAVE_READLINE_H'
+dnl or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
+dnl 'HAVE_HISTORY_H' if the corresponding include files exists.
+dnl
+dnl The libraries that may be readline compatible are `libedit',
+dnl `libeditline' and `libreadline'. Sometimes we need to link a
+dnl termcap library for readline to work, this macro tests these cases
+dnl too by trying to link with `libtermcap', `libcurses' or
+dnl `libncurses' before giving up.
+dnl
+dnl Here is an example of how to use the information provided by this
+dnl macro to perform the necessary includes or declarations in a C
+dnl file:
+dnl
+dnl   #ifdef HAVE_LIBREADLINE
+dnl   #  if defined(HAVE_READLINE_READLINE_H)
+dnl   #    include <readline/readline.h>
+dnl   #  elif defined(HAVE_READLINE_H)
+dnl   #    include <readline.h>
+dnl   #  else /* !defined(HAVE_READLINE_H) */
+dnl   extern char *readline ();
+dnl   #  endif /* !defined(HAVE_READLINE_H) */
+dnl   char *cmdline = NULL;
+dnl   #else /* !defined(HAVE_READLINE_READLINE_H) */
+dnl     /* no readline */
+dnl   #endif /* HAVE_LIBREADLINE */
+dnl
+dnl   #ifdef HAVE_READLINE_HISTORY
+dnl   #  if defined(HAVE_READLINE_HISTORY_H)
+dnl   #    include <readline/history.h>
+dnl   #  elif defined(HAVE_HISTORY_H)
+dnl   #    include <history.h>
+dnl   #  else /* !defined(HAVE_HISTORY_H) */
+dnl   extern void add_history ();
+dnl   extern int write_history ();
+dnl   extern int read_history ();
+dnl   #  endif /* defined(HAVE_READLINE_HISTORY_H) */
+dnl     /* no history */
+dnl   #endif /* HAVE_READLINE_HISTORY */
+dnl
+dnl Modifications to add --enable-gnu-readline to work around licensing
+dnl problems between the traditional BSD licence and the GPL.
+dnl Martin Ebourne, 2005/7/11
+dnl Rewrite to match headers with libraries and be more selective.
+dnl Martin Ebourne, 2006/1/4
+dnl
+dnl @category InstalledPackages
+dnl @author Ville Laurikari <vl@iki.fi>
+dnl @version 2002-04-04
+dnl @license AllPermissive
+
+AC_DEFUN([VL_LIB_READLINE], [
+  AC_ARG_ENABLE(
+    [gnu-readline],
+    AC_HELP_STRING([--enable-gnu-readline],
+                   [Use GNU readline if present (may violate GNU licence)])
+  )
+  vl_cv_lib_readline_compat_found=no
+  if test "x$enable_gnu_readline" = "xyes"; then
+    VL_LIB_READLINE_CHECK([readline],
+                          [readline],
+                          [readline/readline.h readline.h],
+                          [readline/history.h history.h])
+  fi
+  if test "x$vl_cv_lib_readline_compat_found" = "xno"; then
+    VL_LIB_READLINE_CHECK([editline],
+                          [edit editline],
+	  		  [editline/readline.h],
+			  [editline/readline.h])
+  fi
+  if test "x$vl_cv_lib_readline_compat_found" = "xyes"; then
+    m4_ifvaln([$1],[$1],[:])dnl
+    m4_ifvaln([$2],[else $2])dnl
+  fi
+])
+
+dnl VL_LIB_READLINE_CHECK(name, libraries, headers, history headers)
+AC_DEFUN([VL_LIB_READLINE_CHECK], [
+  AC_CACHE_CHECK([for $1 library],
+                 [vl_cv_lib_$1], [
+    ORIG_LIBS="$LIBS"
+    vl_cv_lib_$1=""
+    for readline_lib in $2; do
+      for termcap_lib in "" termcap curses ncurses; do
+        if test -z "$termcap_lib"; then
+          TRY_LIB="-l$readline_lib"
+        else
+          TRY_LIB="-l$readline_lib -l$termcap_lib"
+        fi
+        LIBS="$ORIG_LIBS $TRY_LIB"
+        AC_TRY_LINK_FUNC([readline], [vl_cv_lib_$1="$TRY_LIB"])
+        if test -n "$vl_cv_lib_$1"; then
+          break
+        fi
+      done
+      if test -n "$vl_cv_lib_$1"; then
+        break
+      fi
+    done
+    if test -z "$vl_cv_lib_$1"; then
+      vl_cv_lib_$1=no
+      LIBS="$ORIG_LIBS"
+    fi
+  ])
+
+  vl_cv_lib_readline_compat_found=no
+  if test "x$vl_cv_lib_$1" != "xno"; then
+    AC_CHECK_HEADERS([$3], [vl_cv_lib_readline_compat_found=yes])
+  fi
+
+  if test "x$vl_cv_lib_readline_compat_found" = "xyes"; then
+    AC_DEFINE([HAVE_LIBREADLINE], 1,
+              [Define if you have a readline compatible library])
+
+    AC_CACHE_CHECK([whether $1 supports history],
+                   [vl_cv_lib_$1_history], [
+      vl_cv_lib_$1_history=no
+      AC_TRY_LINK_FUNC([add_history], [vl_cv_lib_$1_history=yes])
+    ])
+    if test "x$vl_cv_lib_$1_history" = "xyes"; then
+      vl_cv_lib_$1_history=no
+      AC_CHECK_HEADERS(
+        [$4],
+	[AC_DEFINE([HAVE_READLINE_HISTORY], [1],
+                   [Define if your readline library has add_history])])
+    fi
+  else
+    LIBS="$ORIG_LIBS"
+  fi
+])dnl