Version:            (using KDE KDE 3.0.99)
Installed from:    Gentoo Packages
OS:          Linux

When you compile a new kpart application with gideon alpha 3, you get the following error message:
myapp.cpp: In member function `void KTilde::fileOpen()': 
* myapp.cpp:172: `KFileDialog' undeclared (first use this function) 
* myapp.cpp:172: (Each undeclared identifier is reported only once for each  
*  function it appears in.) 
* myapp.cpp:172: parse error before `::' token

It works fine if you add the following line to the list of header files in kdevelop/parts/appwizard/kpartapp/app.cpp:
#include <kfiledialog.h>