bluetooth tennis example???

[ChrisW67]

one of them says :
QAbstractSocket: no such file or directory

I bet that was not the first error message. qmake will probably have generated some... and that is before the compiler is run. If you read all the error messages and warnings you will get a clue that perhaps you need more than just the sources in the folder I linked to. Read the *.pro file. You need all of Qt Mobility.

If you are using the Qt SDK then you can probably download it using the SDK updater.