AC_DEFUN([AC_PROG_GNUPLOT],[
AC_REQUIRE([AC_EXEEXT])dnl
AC_PATH_PROG(GNUPLOT, gnuplot$EXEEXT, nocommand)
if test "$GNUPLOT" = nocommand; then
        AC_MSG_WARN([gnuplot not found in $PATH])
else
	AC_DEFINE([HAVE_GNUPLOT], [], [Define if gnuplot is present])
	AC_SUBST(GNUPLOT)
fi;dnl
])