invalid use of incomplete type 'struct TQXEmbed'

Tim, Can you help or shed light how to fix this error? Thanks. xparthost_kpart.cpp: In constructor 'XPartHost_KPart::XPartHost_KPart(TQWidget*, const char*, TQObject*, const char*)': xparthost_kpart.cpp:24: error: invalid use of incomplete type 'struct TQXEmbed' xparthost_kpart.h:10: error: forward declaration of 'struct TQXEmbed' xparthost_kpart.cpp:25: error: no matching function for call to 'XPartHost_KPart::setWidget(TQXEmbed*&)' /opt/trinity/include/kparts/part.h:268: note: candidates are: virtual void KParts::Part::setWidget(TQWidget*) xparthost_kpart.cpp: In member function 'virtual DCOPRef XPartHost_KPart::registerXPart(const DCOPRef&)': xparthost_kpart.cpp:48: error: invalid use of incomplete type 'struct TQXEmbed' xparthost_kpart.h:10: error: forward declaration of 'struct TQXEmbed' xparthost_kpart.cpp:50: error: invalid use of incomplete type 'struct TQXEmbed' xparthost_kpart.h:10: error: forward declaration of 'struct TQXEmbed' make[4]: *** [xparthost_kpart.lo] Error 1 Darrell