[mythtv] I'm working on UNICABLE improvment - help needed

[warpme]

Hi,
Forgive me maybe lame question, but c++ isn't thing I know enough.
 
I want to share&use global variable between all instances of dvbchannel objects.
My idea was to declare this variable as static in dvbchannel.h.
 
class DVBChannel : public DTVChannel
{
  public:
    static QDateTime  last_tuning;
 
It compiles, but unfortunately linker returns:
../../libs/libmythtv/libmythtv-0.27.so: undefined reference to `DVBChannel::last_tuning' 
 
So what is best way to declare global, shared variable used by all instances of dvbchannel ?
 
Thx in advance
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