text: # ===========================================================================
  #      http://www.gnu.org/software/autoconf-archive/ax_with_curses.html
  # ===========================================================================
  #
  # SYNOPSIS
  #
  #   AX_WITH_CURSES
  #
  # DESCRIPTION
  #
  #   This macro checks whether a SysV or X/Open-compatible Curses library is
  #   present, along with the associated header file.  The NcursesW
  #   (wide-character) library is searched for first, followed by Ncurses,
  #   then the system-default plain Curses.  The first library found is the
  #   one returned.
  #
  #   The following options are understood: --with-ncursesw, --with-ncurses,
  #   --without-ncursesw, --without-ncurses.  The "--with" options force the
  #   macro to use that particular library, terminating with an error if not
  #   found.  The "--without" options simply skip the check for that library.
  #   The effect on the search pattern is:
  #
  #     (no options)                           - NcursesW, Ncurses, Curses
  #     --with-ncurses     --with-ncursesw     - NcursesW only [*]
  #     --without-ncurses  --with-ncursesw     - NcursesW only [*]
  #                        --with-ncursesw     - NcursesW only [*]
  #     --with-ncurses     --without-ncursesw  - Ncurses only [*]
  #     --with-ncurses                         - NcursesW, Ncurses [**]
  #     --without-ncurses  --without-ncursesw  - Curses only
  #                        --without-ncursesw  - Ncurses, Curses
  #     --without-ncurses                      - NcursesW, Curses
  #
  #   [*]  If the library is not found, abort the configure script.
  #
  #   [**] If the second library (Ncurses) is not found, abort configure.
  #
  #   The following preprocessor symbols may be defined by this macro if the
  #   appropriate conditions are met:
  #
  #     HAVE_CURSES             - if any SysV or X/Open Curses library found
  #     HAVE_CURSES_ENHANCED    - if library supports X/Open Enhanced functions
  #     HAVE_CURSES_COLOR       - if library supports color (enhanced functions)
  #     HAVE_CURSES_OBSOLETE    - if library supports certain obsolete features
  #     HAVE_NCURSESW           - if NcursesW (wide char) library is to be used
  #     HAVE_NCURSES            - if the Ncurses library is to be used
  #
  #     HAVE_CURSES_H           - if <curses.h> is present and should be used
  #     HAVE_NCURSESW_H         - if <ncursesw.h> should be used
  #     HAVE_NCURSES_H          - if <ncurses.h> should be used
  #     HAVE_NCURSESW_CURSES_H  - if <ncursesw/curses.h> should be used
  #     HAVE_NCURSES_CURSES_H   - if <ncurses/curses.h> should be used
  #
  #   (These preprocessor symbols are discussed later in this document.)
  #
  #   The following output variable is defined by this macro; it is precious
  #   and may be overridden on the ./configure command line:
  #
  #     CURSES_LIB  - library to add to xxx_LDADD
  #
  #   The library listed in CURSES_LIB is NOT added to LIBS by default. You
  #   need to add CURSES_LIB to the appropriate xxx_LDADD line in your
  #   Makefile.am.  For example:
  #
  #     prog_LDADD = @CURSES_LIB@
  #
  #   If CURSES_LIB is set on the configure command line (such as by running
  #   "./configure CURSES_LIB=-lmycurses"), then the only header searched for
  #   is <curses.h>.  The user may use the CPPFLAGS precious variable to
  #   override the standard #include search path.  If the user needs to
  #   specify an alternative path for a library (such as for a non-standard
  #   NcurseW), the user should use the LDFLAGS variable.
  #
  #   The following shell variables may be defined by this macro:
  #
  #     ax_cv_curses           - set to "yes" if any Curses library found
  #     ax_cv_curses_enhanced  - set to "yes" if Enhanced functions present
  #     ax_cv_curses_color     - set to "yes" if color functions present
  #     ax_cv_curses_obsolete  - set to "yes" if obsolete features present
  #
  #     ax_cv_ncursesw      - set to "yes" if NcursesW library found
  #     ax_cv_ncurses       - set to "yes" if Ncurses library found
  #     ax_cv_plaincurses   - set to "yes" if plain Curses library found
  #     ax_cv_curses_which  - set to "ncursesw", "ncurses", "plaincurses" or "no"
  #
  #   These variables can be used in your configure.ac to determine the level
  #   of support you need from the Curses library.  For example, if you must
  #   have either Ncurses or NcursesW, you could include:
  #
  #     AX_WITH_CURSES
  #     if test "x$ax_cv_ncursesw" != xyes && test "x$ax_cv_ncurses" != xyes; then
  #         AX_MSG_ERROR([requires either NcursesW or Ncurses library])
  #     fi
  #
  #   If any Curses library will do (but one must be present and must support
  #   color), you could use:
  #
  #     AX_WITH_CURSES
  #     if test "x$ax_cv_curses" != xyes || test "x$ax_cv_curses_color" != xyes; then
  #         AC_MSG_ERROR([requires an X/Open-compatible Curses library with color])
  #     fi
  #
  #   Certain preprocessor symbols and shell variables defined by this macro
  #   can be used to determine various features of the Curses library.  In
  #   particular, HAVE_CURSES and ax_cv_curses are defined if the Curses
  #   library found conforms to the traditional SysV and/or X/Open Base Curses
  #   definition.  Any working Curses library conforms to this level.
  #
  #   HAVE_CURSES_ENHANCED and ax_cv_curses_enhanced are defined if the
  #   library supports the X/Open Enhanced Curses definition.  In particular,
  #   the wide-character types attr_t, cchar_t and wint_t, the functions
  #   wattr_set() and wget_wch() and the macros WA_NORMAL and _XOPEN_CURSES
  #   are checked.  The Ncurses library does NOT conform to this definition,
  #   although NcursesW does.
  #
  #   HAVE_CURSES_COLOR and ax_cv_curses_color are defined if the library
  #   supports color functions and macros such as COLOR_PAIR, A_COLOR,
  #   COLOR_WHITE, COLOR_RED and init_pair().  These are NOT part of the
  #   X/Open Base Curses definition, but are part of the Enhanced set of
  #   functions.  The Ncurses library DOES support these functions, as does
  #   NcursesW.
  #
  #   HAVE_CURSES_OBSOLETE and ax_cv_curses_obsolete are defined if the
  #   library supports certain features present in SysV and BSD Curses but not
  #   defined in the X/Open definition.  In particular, the functions
  #   getattrs(), getcurx() and getmaxx() are checked.
  #
  #   To use the HAVE_xxx_H preprocessor symbols, insert the following into
  #   your system.h (or equivalent) header file:
  #
  #     #if defined HAVE_NCURSESW_CURSES_H
  #     #  include <ncursesw/curses.h>
  #     #elif defined HAVE_NCURSESW_H
  #     #  include <ncursesw.h>
  #     #elif defined HAVE_NCURSES_CURSES_H
  #     #  include <ncurses/curses.h>
  #     #elif defined HAVE_NCURSES_H
  #     #  include <ncurses.h>
  #     #elif defined HAVE_CURSES_H
  #     #  include <curses.h>
  #     #else
  #     #  error "SysV or X/Open-compatible Curses header file required"
  #     #endif
  #
  #   For previous users of this macro: you should not need to change anything
  #   in your configure.ac or Makefile.am, as the previous (serial 10)
  #   semantics are still valid.  However, you should update your system.h (or
  #   equivalent) header file to the fragment shown above. You are encouraged
  #   also to make use of the extended functionality provided by this version
  #   of AX_WITH_CURSES, as well as in the additional macros
  #   AX_WITH_CURSES_PANEL, AX_WITH_CURSES_MENU and AX_WITH_CURSES_FORM.
  #
  # LICENSE
  #
  #   Copyright (c) 2009 Mark Pulford <mark@kyne.com.au>
  #   Copyright (c) 2009 Damian Pietras <daper@daper.net>
  #   Copyright (c) 2012 Reuben Thomas <rrt@sc3d.org>
  #   Copyright (c) 2011 John Zaitseff <J.Zaitseff@zap.org.au>
  #
  #   This program is free software: you can redistribute it and/or modify it
  #   under the terms of the GNU General Public License as published by the
  #   Free Software Foundation, either version 3 of the License, or (at your
  #   option) any later version.
  #
  #   This program is distributed in the hope that it will be useful, but
  #   WITHOUT ANY WARRANTY; without even the implied warranty of
  #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  #   Public License for more details.
  #
  #   You should have received a copy of the GNU General Public License along
  #   with this program. If not, see <http://www.gnu.org/licenses/>.
  #
  #   As a special exception, the respective Autoconf Macro's copyright owner
  #   gives unlimited permission to copy, distribute and modify the configure
  #   scripts that are the output of Autoconf when processing the Macro. You
  #   need not follow the terms of the GNU General Public License when using
  #   or distributing such scripts, even though portions of the text of the
  #   Macro appear in them. The GNU General Public License (GPL) does govern
  #   all other use of the material that constitutes the Autoconf Macro.
  #
  #   This special exception to the GPL applies to versions of the Autoconf
  #   Macro released by the Autoconf Archive. When you make and distribute a
  #   modified version of the Autoconf Macro, you may extend this special
  #   exception to the GPL to apply to your modified version as well.
  
  #serial 13
  
  AC_DEFUN([AX_WITH_CURSES], [
      AC_ARG_VAR([CURSES_LIB], [linker library for Curses, e.g. -lcurses])
      AC_ARG_WITH([ncurses], [AS_HELP_STRING([--with-ncurses],
          [force the use of Ncurses or NcursesW])],
          [], [with_ncurses=check])
      AC_ARG_WITH([ncursesw], [AS_HELP_STRING([--without-ncursesw],
          [do not use NcursesW (wide character support)])],
          [], [with_ncursesw=check])
  
      ax_saved_LIBS=$LIBS
      AS_IF([test "x$with_ncurses" = xyes || test "x$with_ncursesw" = xyes],
          [ax_with_plaincurses=no], [ax_with_plaincurses=check])
  
      ax_cv_curses_which=no
  
      # Test for NcursesW
  
      AS_IF([test "x$CURSES_LIB" = x && test "x$with_ncursesw" != xno], [
          LIBS="$ax_saved_LIBS -lncursesw"
  
          AC_CACHE_CHECK([for NcursesW wide-character library], [ax_cv_ncursesw], [
              AC_LINK_IFELSE([AC_LANG_CALL([], [initscr])],
                  [ax_cv_ncursesw=yes], [ax_cv_ncursesw=no])
          ])
          AS_IF([test "x$ax_cv_ncursesw" = xno && test "x$with_ncursesw" = xyes], [
              AC_MSG_ERROR([--with-ncursesw specified but could not find NcursesW library])
          ])
  
          AS_IF([test "x$ax_cv_ncursesw" = xyes], [
              ax_cv_curses=yes
              ax_cv_curses_which=ncursesw
              CURSES_LIB="-lncursesw"
              AC_DEFINE([HAVE_NCURSESW], [1], [Define to 1 if the NcursesW library is present])
              AC_DEFINE([HAVE_CURSES],   [1], [Define to 1 if a SysV or X/Open compatible Curses library is present])
  
              AC_CACHE_CHECK([for working ncursesw/curses.h], [ax_cv_header_ncursesw_curses_h], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@define _XOPEN_SOURCE_EXTENDED 1
                          @%:@include <ncursesw/curses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          chtype c = COLOR_PAIR(1) & A_COLOR;
                          attr_t d = WA_NORMAL;
                          cchar_t e;
                          wint_t f;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                          init_pair(1, COLOR_WHITE, COLOR_RED);
                          wattr_set(stdscr, d, 0, NULL);
                          wget_wch(stdscr, &f);
                      ]])],
                      [ax_cv_header_ncursesw_curses_h=yes],
                      [ax_cv_header_ncursesw_curses_h=no])
              ])
              AS_IF([test "x$ax_cv_header_ncursesw_curses_h" = xyes], [
                  ax_cv_curses_enhanced=yes
                  ax_cv_curses_color=yes
                  ax_cv_curses_obsolete=yes
                  AC_DEFINE([HAVE_CURSES_ENHANCED],   [1], [Define to 1 if library supports X/Open Enhanced functions])
                  AC_DEFINE([HAVE_CURSES_COLOR],      [1], [Define to 1 if library supports color (enhanced functions)])
                  AC_DEFINE([HAVE_CURSES_OBSOLETE],   [1], [Define to 1 if library supports certain obsolete features])
                  AC_DEFINE([HAVE_NCURSESW_CURSES_H], [1], [Define to 1 if <ncursesw/curses.h> is present])
              ])
  
              AC_CACHE_CHECK([for working ncursesw.h], [ax_cv_header_ncursesw_h], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@define _XOPEN_SOURCE_EXTENDED 1
                          @%:@include <ncursesw.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          chtype c = COLOR_PAIR(1) & A_COLOR;
                          attr_t d = WA_NORMAL;
                          cchar_t e;
                          wint_t f;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                          init_pair(1, COLOR_WHITE, COLOR_RED);
                          wattr_set(stdscr, d, 0, NULL);
                          wget_wch(stdscr, &f);
                      ]])],
                      [ax_cv_header_ncursesw_h=yes],
                      [ax_cv_header_ncursesw_h=no])
              ])
              AS_IF([test "x$ax_cv_header_ncursesw_h" = xyes], [
                  ax_cv_curses_enhanced=yes
                  ax_cv_curses_color=yes
                  ax_cv_curses_obsolete=yes
                  AC_DEFINE([HAVE_CURSES_ENHANCED], [1], [Define to 1 if library supports X/Open Enhanced functions])
                  AC_DEFINE([HAVE_CURSES_COLOR],    [1], [Define to 1 if library supports color (enhanced functions)])
                  AC_DEFINE([HAVE_CURSES_OBSOLETE], [1], [Define to 1 if library supports certain obsolete features])
                  AC_DEFINE([HAVE_NCURSESW_H],      [1], [Define to 1 if <ncursesw.h> is present])
              ])
  
              AC_CACHE_CHECK([for working ncurses.h], [ax_cv_header_ncurses_h_with_ncursesw], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@define _XOPEN_SOURCE_EXTENDED 1
                          @%:@include <ncurses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          chtype c = COLOR_PAIR(1) & A_COLOR;
                          attr_t d = WA_NORMAL;
                          cchar_t e;
                          wint_t f;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                          init_pair(1, COLOR_WHITE, COLOR_RED);
                          wattr_set(stdscr, d, 0, NULL);
                          wget_wch(stdscr, &f);
                      ]])],
                      [ax_cv_header_ncurses_h_with_ncursesw=yes],
                      [ax_cv_header_ncurses_h_with_ncursesw=no])
              ])
              AS_IF([test "x$ax_cv_header_ncurses_h_with_ncursesw" = xyes], [
                  ax_cv_curses_enhanced=yes
                  ax_cv_curses_color=yes
                  ax_cv_curses_obsolete=yes
                  AC_DEFINE([HAVE_CURSES_ENHANCED], [1], [Define to 1 if library supports X/Open Enhanced functions])
                  AC_DEFINE([HAVE_CURSES_COLOR],    [1], [Define to 1 if library supports color (enhanced functions)])
                  AC_DEFINE([HAVE_CURSES_OBSOLETE], [1], [Define to 1 if library supports certain obsolete features])
                  AC_DEFINE([HAVE_NCURSES_H],       [1], [Define to 1 if <ncurses.h> is present])
              ])
  
              AS_IF([test "x$ax_cv_header_ncursesw_curses_h" = xno && test "x$ax_cv_header_ncursesw_h" = xno && test "x$ax_cv_header_ncurses_h_with_ncursesw" = xno], [
                  AC_MSG_WARN([could not find a working ncursesw/curses.h, ncursesw.h or ncurses.h])
              ])
          ])
      ])
  
      # Test for Ncurses
  
      AS_IF([test "x$CURSES_LIB" = x && test "x$with_ncurses" != xno && test "x$ax_cv_curses_which" = xno], [
          LIBS="$ax_saved_LIBS -lncurses"
  
          AC_CACHE_CHECK([for Ncurses library], [ax_cv_ncurses], [
              AC_LINK_IFELSE([AC_LANG_CALL([], [initscr])],
                  [ax_cv_ncurses=yes], [ax_cv_ncurses=no])
          ])
          AS_IF([test "x$ax_cv_ncurses" = xno && test "x$with_ncurses" = xyes], [
              AC_MSG_ERROR([--with-ncurses specified but could not find Ncurses library])
          ])
  
          AS_IF([test "x$ax_cv_ncurses" = xyes], [
              ax_cv_curses=yes
              ax_cv_curses_which=ncurses
              CURSES_LIB="-lncurses"
              AC_DEFINE([HAVE_NCURSES], [1], [Define to 1 if the Ncurses library is present])
              AC_DEFINE([HAVE_CURSES],  [1], [Define to 1 if a SysV or X/Open compatible Curses library is present])
  
              AC_CACHE_CHECK([for working ncurses/curses.h], [ax_cv_header_ncurses_curses_h], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@include <ncurses/curses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          chtype c = COLOR_PAIR(1) & A_COLOR;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                          init_pair(1, COLOR_WHITE, COLOR_RED);
                      ]])],
                      [ax_cv_header_ncurses_curses_h=yes],
                      [ax_cv_header_ncurses_curses_h=no])
              ])
              AS_IF([test "x$ax_cv_header_ncurses_curses_h" = xyes], [
                  ax_cv_curses_color=yes
                  ax_cv_curses_obsolete=yes
                  AC_DEFINE([HAVE_CURSES_COLOR],     [1], [Define to 1 if library supports color (enhanced functions)])
                  AC_DEFINE([HAVE_CURSES_OBSOLETE],  [1], [Define to 1 if library supports certain obsolete features])
                  AC_DEFINE([HAVE_NCURSES_CURSES_H], [1], [Define to 1 if <ncurses/curses.h> is present])
              ])
  
              AC_CACHE_CHECK([for working ncurses.h], [ax_cv_header_ncurses_h], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@include <ncurses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          chtype c = COLOR_PAIR(1) & A_COLOR;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                          init_pair(1, COLOR_WHITE, COLOR_RED);
                      ]])],
                      [ax_cv_header_ncurses_h=yes],
                      [ax_cv_header_ncurses_h=no])
              ])
              AS_IF([test "x$ax_cv_header_ncurses_h" = xyes], [
                  ax_cv_curses_color=yes
                  ax_cv_curses_obsolete=yes
                  AC_DEFINE([HAVE_CURSES_COLOR],    [1], [Define to 1 if library supports color (enhanced functions)])
                  AC_DEFINE([HAVE_CURSES_OBSOLETE], [1], [Define to 1 if library supports certain obsolete features])
                  AC_DEFINE([HAVE_NCURSES_H],       [1], [Define to 1 if <ncurses.h> is present])
              ])
  
              AS_IF([test "x$ax_cv_header_ncurses_curses_h" = xno && test "x$ax_cv_header_ncurses_h" = xno], [
                  AC_MSG_WARN([could not find a working ncurses/curses.h or ncurses.h])
              ])
          ])
      ])
  
      # Test for plain Curses (or if CURSES_LIB was set by user)
  
      AS_IF([test "x$with_plaincurses" != xno && test "x$ax_cv_curses_which" = xno], [
          AS_IF([test "x$CURSES_LIB" != x], [
              LIBS="$ax_saved_LIBS $CURSES_LIB"
          ], [
              LIBS="$ax_saved_LIBS -lcurses"
          ])
  
          AC_CACHE_CHECK([for Curses library], [ax_cv_plaincurses], [
              AC_LINK_IFELSE([AC_LANG_CALL([], [initscr])],
                  [ax_cv_plaincurses=yes], [ax_cv_plaincurses=no])
          ])
  
          AS_IF([test "x$ax_cv_plaincurses" = xyes], [
              ax_cv_curses=yes
              ax_cv_curses_which=plaincurses
              AS_IF([test "x$CURSES_LIB" = x], [
                  CURSES_LIB="-lcurses"
              ])
              AC_DEFINE([HAVE_CURSES], [1], [Define to 1 if a SysV or X/Open compatible Curses library is present])
  
              # Check for base conformance (and header file)
  
              AC_CACHE_CHECK([for working curses.h], [ax_cv_header_curses_h], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@include <curses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          initscr();
                      ]])],
                      [ax_cv_header_curses_h=yes],
                      [ax_cv_header_curses_h=no])
              ])
              AS_IF([test "x$ax_cv_header_curses_h" = xyes], [
                  AC_DEFINE([HAVE_CURSES_H], [1], [Define to 1 if <curses.h> is present])
  
                  # Check for X/Open Enhanced conformance
  
                  AC_CACHE_CHECK([for X/Open Enhanced Curses conformance], [ax_cv_plaincurses_enhanced], [
                      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                              @%:@define _XOPEN_SOURCE_EXTENDED 1
                              @%:@include <curses.h>
                              @%:@ifndef _XOPEN_CURSES
                              @%:@error "this Curses library is not enhanced"
                              "this Curses library is not enhanced"
                              @%:@endif
                          ]], [[
                              chtype a = A_BOLD;
                              int b = KEY_LEFT;
                              chtype c = COLOR_PAIR(1) & A_COLOR;
                              attr_t d = WA_NORMAL;
                              cchar_t e;
                              wint_t f;
                              initscr();
                              init_pair(1, COLOR_WHITE, COLOR_RED);
                              wattr_set(stdscr, d, 0, NULL);
                              wget_wch(stdscr, &f);
                          ]])],
                          [ax_cv_plaincurses_enhanced=yes],
                          [ax_cv_plaincurses_enhanced=no])
                  ])
                  AS_IF([test "x$ax_cv_plaincurses_enhanced" = xyes], [
                      ax_cv_curses_enhanced=yes
                      ax_cv_curses_color=yes
                      AC_DEFINE([HAVE_CURSES_ENHANCED], [1], [Define to 1 if library supports X/Open Enhanced functions])
                      AC_DEFINE([HAVE_CURSES_COLOR],    [1], [Define to 1 if library supports color (enhanced functions)])
                  ])
  
                  # Check for color functions
  
                  AC_CACHE_CHECK([for Curses color functions], [ax_cv_plaincurses_color], [
                      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@define _XOPEN_SOURCE_EXTENDED 1
                          @%:@include <curses.h>
                          ]], [[
                              chtype a = A_BOLD;
                              int b = KEY_LEFT;
                              chtype c = COLOR_PAIR(1) & A_COLOR;
                              initscr();
                              init_pair(1, COLOR_WHITE, COLOR_RED);
                          ]])],
                          [ax_cv_plaincurses_color=yes],
                          [ax_cv_plaincurses_color=no])
                  ])
                  AS_IF([test "x$ax_cv_plaincurses_color" = xyes], [
                      ax_cv_curses_color=yes
                      AC_DEFINE([HAVE_CURSES_COLOR], [1], [Define to 1 if library supports color (enhanced functions)])
                  ])
  
                  # Check for obsolete functions
  
                  AC_CACHE_CHECK([for obsolete Curses functions], [ax_cv_plaincurses_obsolete], [
                  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                          @%:@include <curses.h>
                      ]], [[
                          chtype a = A_BOLD;
                          int b = KEY_LEFT;
                          int g = getattrs(stdscr);
                          int h = getcurx(stdscr) + getmaxx(stdscr);
                          initscr();
                      ]])],
                      [ax_cv_plaincurses_obsolete=yes],
                      [ax_cv_plaincurses_obsolete=no])
                  ])
                  AS_IF([test "x$ax_cv_plaincurses_obsolete" = xyes], [
                      ax_cv_curses_obsolete=yes
                      AC_DEFINE([HAVE_CURSES_OBSOLETE], [1], [Define to 1 if library supports certain obsolete features])
                  ])
              ])
  
              AS_IF([test "x$ax_cv_header_curses_h" = xno], [
                  AC_MSG_WARN([could not find a working curses.h])
              ])
          ])
      ])
  
      AS_IF([test "x$ax_cv_curses"          != xyes], [ax_cv_curses=no])
      AS_IF([test "x$ax_cv_curses_enhanced" != xyes], [ax_cv_curses_enhanced=no])
      AS_IF([test "x$ax_cv_curses_color"    != xyes], [ax_cv_curses_color=no])
      AS_IF([test "x$ax_cv_curses_obsolete" != xyes], [ax_cv_curses_obsolete=no])
  
      LIBS=$ax_saved_LIBS
  ])dnl
  