Error including nRF Cloud Libraries: undefined reference to `nrf_cloud_connect'

Question

I'm using a custom device that is based on the nRF9160. I'd like to get it registered on nRF Cloud in order to make use of features such as AGPS, PGPS, Cell-Positioning and FOTA. 
 An snippet of a part of my code below: 
 #include "cJSON.h"
#include "net/nrf_cloud.h"
#include "net/nrf_cloud_cell_pos.h"
#include "net/nrf_cloud_agps.h"
#include "net/nrf_cloud_pgps.h"

if (lte_connected){
	int err;	
	err = nrf_cloud_connect();
	if (err) {
 LOG_ERR("nrf_cloud_connect failed: %d", err);
	} else {
 LOG_INF("nRF Cloud successfully connected");
	}
} 
 
 When compiling I get the error: 
 C:\XXX\src\main.c:1191: undefined reference to `nrf_cloud_connect'
collect2.exe: error: ld returned 1 exit status 
 
 Using VS Code with the nRF Connect plugin and SDK v2.1.0. Modem firmware updated to v1.3.4 
 
 Am I including the wrong libraries? Are there some compatibility issues I'm not aware of? Any assistance will be appreciated. Please point me in the right direction :)

Rey · Accepted Answer

This particular problem seemed to be caused by some missing settings in the prj.conf file. I suspect that it was: 
 
 CONFIG_NRF_CLOUD_MQTT =y

Error including nRF Cloud Libraries: undefined reference to `nrf_cloud_connect'

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