Ntopng on LEDE

Can any one tell me how to install ntopng in lede..........?
I have cloned ntopng in my device, when i tried to install it.
i got an error like there is no GCC . when i tried to install i have no space left in /overlay...

is there any other options to install it???

The flash space not enough...

The same error information when I try to install more modules in LEDE official firmware with 4M flash router. You can try to modify the flash memory on your device.

this is not the right way to do it, never build something on the device, port the app to the device by using the SDK, it might not be easy but you'll learn something