installation:

1. UNPACK tar FILES
2. link ln -sf /usr/dcf/clk /etc/clk
3. Define variable DCF_DEV e.g.:
	DCF_DEV=/dev/tty1a;export DCF_DEV
    It specifies the device DCF is connected to.
4. Define variable DCF_PERIOD e.g.
    	DCF_PERIOD=600;
        export DCF_PERIOD
	  
   Specifies time interval of updating PC
5. RUN clk 
   Note: YOu can run "clk" from  sarting files /etc/rc2.d
