I am reposting this again in case missed out.

i have installed

```
sudo apt-get install libbluetooth-dev

```

and tried to compile btgatt-client.c from Blue5.54/tools/ with

```
gcc -o btgatt-client btgatt-client.c -lbluetooth

```

but get `'#include "lib/bluetooth.h":no such file or directory'`

What could be missing.I have tried move the files from `'/usr/include/bluetooth'`
the compilation folder but seems doesn't work. I am also curious where does this `"src/shared/mainloop"` from?

I am able to run the example and connect to nrf app but unable to compile the .c file.