This is an example for using icarus to compile verilog file and anslyse the wave with gtkwave
requrement:
    icarus verilog
    gtkwave
install:
    make
    gtkwave tb.lxt
notice:
    $dumpfile
    $dumpvars
    $dumpflush
    these three statement must be added in the testbech file,inorder to ayalyse the wave with gtkwave;