dnl Written by Laurynas Biveinis
dnl GNU Autoconf macro AC_CXX_OPT(option)
dnl Checks if C++ compiler supports specified option.
dnl If yes - adds that option to CXXFLAGS.

AC_DEFUN(AC_CXX_OPT,
[
   AC_REQUIRE([AC_PROG_CXX])
   AC_REQUIRE([AC_LANG_CPLUSPLUS])
   AC_MSG_CHECKING([if C++ compiler supports $1 option])
   old_cxxflags=$CXXFLAGS
   CXXFLAGS="$1 $CXXFLAGS"
   AC_TRY_COMPILE([ ], [ ], test_opt=yes)
   if test -z test_opt; then
      CXXFLAGS=$old_cxxflags
      AC_MSG_RESULT(no)
   else
      AC_MSG_RESULT(yes)
fi
])

dnl GNU Autoconf macro AC_LIB_TVISION
dnl Checks for Turbo Vision library. If it is available - adds it
dnl to LIBS variable and defines HAVE_TVISION.

AC_DEFUN(AC_LIB_TVISION, 
[
   AC_REQUIRE([AC_PROG_CXX])
   AC_REQUIRE([AC_LANG_CPLUSPLUS])
   AC_MSG_CHECKING([for Turbo Vision library])
   ac_lb_save_LIBS="$LIBS"
   LIBS="-lrhtv $LIBS"
   AC_TRY_LINK([void win_ver(void);], [win_ver();], AC_DEFINE(HAVE_TVISION) tvlib=RHTV)
   if test -z $tvlib; then
      LIBS=$ac_lb_save_LIBS
      LIBS="-ltv $LIBS"
      AC_TRY_LINK([void win_ver(void);], [win_ver();], AC_DEFINE(HAVE_TVISION) tvlib=TV)
      if test -z $tvlib; then
         LIBS=$ac_lb_save_LIBS
         AC_MSG_WARN(not found)
      else
         AC_MSG_RESULT([old version 1.0.3- found])
      fi
   else
      AC_MSG_RESULT(v1.0.4+ found)
   fi
])