build VESC Tool on Linux Mint

Good afternoon,

First of all: Thank you for the VESC - a really well designed piece of hardware!  After using it with the VESC Tool on Windows I thought it might be a good idea to start using the VESC Tool on Linux (Mint)...

I managed to install Qt SDK (Qt Creator 3.5.1 / Qt 5.5.1) and to clone the repository. When trying to build I get the following issue:

QSerialPort: No such file or directory

/home/.../vesc_tool/vescinterface.h

I assume that an include fails - but how&where do I get the missing files?

Thanks in advance you for your help!
/cb