+AC_SUBST(GENERATED_EXT_FUNCS)
+
+AC_MSG_CHECKING(if you want to build with experimental SCREEN extensions)
+AC_ARG_ENABLE(sp-funcs,
+ [ --enable-sp-funcs enable experimental SCREEN-extensions],
+ [with_sp_funcs=$enableval],
+ [with_sp_funcs=no])
+AC_MSG_RESULT($with_sp_funcs)
+if test "$with_sp_funcs" = yes ; then
+ NCURSES_SP_FUNCS=1
+ AC_DEFINE(NCURSES_SP_FUNCS)
+ GENERATED_SP_FUNCS=generated
+else
+ NCURSES_SP_FUNCS=0
+ GENERATED_SP_FUNCS=
+fi
+AC_SUBST(NCURSES_SP_FUNCS)
+AC_SUBST(GENERATED_SP_FUNCS)
+
+AC_MSG_CHECKING(if you want to build with experimental terminal-driver)
+AC_ARG_ENABLE(term-driver,
+ [ --enable-term-driver enable experimental terminal-driver],
+ [with_term_driver=$enableval],
+ [with_term_driver=no])
+AC_MSG_RESULT($with_term_driver)
+if test "$with_term_driver" = yes ; then
+ AC_DEFINE(USE_TERM_DRIVER)
+ if test "$with_sp_funcs" != yes ; then
+ AC_MSG_ERROR(The term-driver option relies upon sp-funcs)
+ fi
+fi