+dnl Check for likely values of acs_map[]:
+AC_CACHE_CHECK(for alternate character set array, cf_cv_curses_acs_map,[
+cf_cv_curses_acs_map=unknown
+for name in acs_map _acs_map __acs_map _nc_acs_map
+do
+AC_TRY_LINK([
+#include <curses.h>
+],[
+$name['k'] = ACS_PLUS
+],[cf_cv_curses_acs_map=$name; break])
+done
+])
+
+test "$cf_cv_curses_acs_map" != unknown && AC_DEFINE_UNQUOTED(CURSES_ACS_ARRAY,$cf_cv_curses_acs_map)
+
+dnl ---------------------------------------------------------------------------
+dnl Check for likely values of wacs_map[]:
+AC_CACHE_CHECK(for wide alternate character set array, cf_cv_curses_wacs_map,[
+cf_cv_curses_wacs_map=unknown
+for name in wacs_map _wacs_map __wacs_map _nc_wacs
+do
+AC_TRY_LINK([
+#ifndef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED
+#endif
+#include <curses.h>
+],[
+$name['k'] = *WACS_PLUS
+],[cf_cv_curses_wacs_map=$name; break])
+done
+])
+
+test "$cf_cv_curses_wacs_map" != unknown && AC_DEFINE_UNQUOTED(CURSES_WACS_ARRAY,$cf_cv_curses_wacs_map)
+
+dnl ---------------------------------------------------------------------------
+dnl Make an uppercase version of a variable
+dnl $1=uppercase($2)
+AC_DEFUN([CF_UPPER],
+[
+$1=`echo "$2" | sed y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%`
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Check if curses.h defines the given type
+AC_DEFUN([CF_CURSES_TYPE],
+[
+AC_MSG_CHECKING(for type $1 in curses.h)
+AC_TRY_COMPILE([
+#ifndef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED
+#endif
+#include <curses.h>],[
+$1 foo
+],cf_result=yes,cf_result=no)
+AC_MSG_RESULT($cf_result)
+if test $cf_result = yes ; then
+ CF_UPPER(cf_result,have_type_$1)
+ AC_DEFINE_UNQUOTED($cf_result)
+else
+ AC_DEFINE_UNQUOTED($1,$2)
+fi
+])dnl
+
+CF_CURSES_TYPE(attr_t,long)
+CF_CURSES_TYPE(mbstate_t,long)
+
+dnl ---------------------------------------------------------------------------
+dnl Check if we can include <sys/time.h> with <sys/select.h>; this breaks on
+dnl older SCO configurations.