Adafruit ultimate gps breakout module with beaglebone black wireless- UART issue - c

I am using the Adafruit Ultimate GPS breakout module to interface with the beaglebone black using c code. I am using UART 4 for that, but while running after compile it won't show any output. I changed the port name to "dev/ttyO4" in serial.h file.
thank you!!!
git hub link for the library: https://github.com/joyalraju/libgps
#include <stdio.h>
#include <stdlib.h>
#include <gps.h>
int main(void) {
// Open
gps_init();
loc_t data;
while (1) {
gps_location(&data);
printf("%lf %lf\n", data.latitude, data.longitude);
}
return EXIT_SUCCESS;
}


Joyal If you add your code with question make it easy to find out the problem.

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Thanks #Craig Estey for your help. I "fixed" the problem running the program directly to the terminal in the RaspberryPi so I used the next format for running it
$ nano pwm_motor.c //for creating the programm
$ gcc -Waöö pwm_motor.c -lwiring -o pwm_motor // for compile the programm
$ chmod +x pwm_motor // for build the program
$ sudo ./pwm_motor //for running the program
Maybe is not the best way but it worked for me. if someone else knows another idea I love reading it.

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