+AC_CACHE_CHECK([if readline supports add_history], [dx_cv_rl_add_history], [dnl
+dx_cv_rl_add_history=no
+dx_save_libs=$LIBS
+LIBS="$LIBS $LIBREADLINE"
+AC_LINK_IFELSE([AC_LANG_PROGRAM([dnl
+#include <stdio.h>
+#if HAVE_READLINE_HISTORY_H
+# include <readline/history.h>
+#endif
+], [dnl
+(*add_history)("");
+])], [dx_cv_rl_add_history=yes], [dx_cv_rl_add_history=no])
+LIBS=$dx_save_libs
+])
+
+AS_IF([test x"$dx_cv_rl_add_history" = x"yes"],
+ [AC_DEFINE([HAVE_RL_ADD_HISTORY], [1],
+ [Define to 1 if readline supports add_history.])])
+
+m4_include([lib/gnulib.mk])
+DX_GLSYM_PREFIX([cdecl__])
+
+dnl We provide our own makefile rules for gettext. Disable tracing of
+dnl AM_GNU_GETTEXT to prevent autoreconf from running autopoint, and to
+dnl prevent automake from growing gratuitous error conditions.
+m4_traceoff([AM_GNU_GETTEXT])
+AM_GNU_GETTEXT([external])
+DX_LINGUAS
+