gnuplot problem under Xfree86

[jtorres]

        I just compiled gnuplot-3.7 from source files for
        cygwin under Xfree86. Every thing was running fine
        for a postscript terminal, but it fails for a
        X11 terminal, for instance plotted lines fall outside
        the graph viewport and the screen appear filled of 
        a red surface. Anybody knows what is going on?

        Joaquin