I don't know why the Nokia forum site decided to do their helloworld in C++ when every program that comes with the device is written in C. You're right- it just doesn't ship with certain libraries used for C++. The command you need is 'apt-get install libhildonmm'. Always good to follow this up with apt-get clean. You can also use a relative path, ./helloworld for example. Only two extra keystrokes that way!