error:expected class name before {

[Timoteo]

Do you realize that server.h includes itself?

[franz]

It looks like QMainWindow is unknown in your server.h file. QApplication and QDialog don't include it for you. You should probably do something like:

...
#include <QtGui/QMainWindow>
...
class server : public QMainWindow
{
...

...
#include <QtGui/QMainWindow>
...
class server : public QMainWindow
{
...

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