Error when build kdewidgets in kdelibs

[younker]

There is an error when build kdewidgets on Mac OS,
kdewidgets.moc can not be generated, it is included in kdewidgets.cpp.

Below is the error message.

younker [kdewidgets]$ make
[ 15%] Built target kdecore
[ 15%] Built target makekdewidgets
[ 15%] Built target kdefx
[ 51%] Built target kdeui
[ 66%] Built target solid
[ 66%] Built target kdesu
[ 90%] Built target kio
Linking CXX shared library ../lib/libkparts.dylib
[ 93%] Built target kparts
Linking CXX shared library ../lib/libkde3support.dylib
[100%] Built target kde3support
[100%] Generating kdewidgets.moc
/Users/younker/MacData/kde4/build/kdelibs/kdewidgets/kdewidgets.cpp:69:
Error: Undefined interface
make[2]: *** [kdewidgets/kdewidgets.moc] Error 1
make[1]: *** [kdewidgets/CMakeFiles/kdewidgets.dir/all] Error 2
make: *** [all] Error 2

Regards.
mac.younker at gmail.com