derived class error

[mookster66]

I keep get an error saying: error expected class-name befor '{' token

  #ifndef EXTCLOCKTYPE_H
#define EXTCLOCKTYPE_H

#include <string>

class extClockType: public clockType
{ //<<<<------------------------------------- the error is right here
    public:
        void setZone(std::string zone);
        void getZone(std::string& zone) const;
        void printZone() const;
        extClockType(std::string zone);
        extClockType();

    private:
        std::string TZ;
};

#endif 

[Peter87]

You have not defined clockType.