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diff --git a/acinclude.m4 b/acinclude.m4
index 5d443ec..c8eba20 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -81,3 +81,101 @@ if test ".$ac_cv_func_initscr" != .yes ; then
 fi
 
 ])])
+
+
+
+dnl @synopsis AC_LIB_READLINE
+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 termcap
+dnl library for readline to work, this macro tests these cases too by
+dnl trying to link with `libtermcap', `libcurses' or `libncurses' before
+dnl 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 file:
+dnl
+dnl   #include <config.h>
+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
+dnl @version $Id$
+dnl @author Ville Laurikari <vl@iki.fi>
+dnl
+AC_DEFUN([AC_LIB_READLINE], [
+  AC_CACHE_CHECK([for a readline compatible library],
+                 ac_cv_lib_readline, [
+    ORIG_LIBS="$LIBS"
+    for readline_lib in readline edit editline; do
+      for termcap_lib in "" termcap curses ncurses; do
+        if test -z "$termcap_lib"; then
+          TRY_LIB="-l$readline_lib"
+        else
+          TRY_LIB="-l$readline_lib -l$termcap_lib"
+        fi
+        LIBS="$ORIG_LIBS $TRY_LIB"
+        AC_TRY_LINK_FUNC(readline, ac_cv_lib_readline="$TRY_LIB")
+        if test -n "$ac_cv_lib_readline"; then
+          break
+        fi
+      done
+      if test -n "$ac_cv_lib_readline"; then
+        break
+      fi
+    done
+    if test -z "$ac_cv_lib_readline"; then
+      ac_cv_lib_readline="no"
+    fi
+    LIBS="$ORIG_LIBS"
+  ])
+
+  if test "$ac_cv_lib_readline" != "no"; then
+    LIBS="$LIBS $ac_cv_lib_readline"
+    AC_DEFINE(HAVE_LIBREADLINE, 1,
+              [Define if you have a readline compatible library])
+    AC_CHECK_HEADERS(readline.h readline/readline.h)
+    AC_CACHE_CHECK([whether readline supports history],
+                   ac_cv_lib_readline_history, [
+      ac_cv_lib_readline_history="no"
+      AC_TRY_LINK_FUNC(add_history, ac_cv_lib_readline_history="yes")
+    ])
+    if test "$ac_cv_lib_readline_history" = "yes"; then
+      AC_DEFINE(HAVE_READLINE_HISTORY, 1,
+                [Define if your readline library has \`add_history'])
+      AC_CHECK_HEADERS(history.h readline/history.h)
+    fi
+  fi
+
+])