“undefined reference” error after adding function to a C project

I've added a new function wiringPiVersion() to wiringPi, but after I build and install the shared library, when I attempt to compile a small C program around it, I get:

wpi_ver.c:(.text+0xc): undefined reference to `wiringPiVersion'

However, when I include it in an XS based Perl module, all works well. I don't know enough about C to figure out what's going wrong here, and I've been searching for the better part of two hours trying different things to no avail.

Here's my small C program to test the new function:

#include <stdio.h>
#include <wiringPi.h>

int main (){
    char * ver = wiringPiVersion();
    printf("wiringPi version: %s\n", ver);
    return 0;
}

Compilation that throws the error:

gcc -o ver wpi_ver.c -lwiringPi

The addition to wiringPi's header file:

extern char * wiringPiVersion(void);

The wiringPi's .c file addition:

#define WPI_VERSION "2.36"

char * wiringPiVersion(void){
    return WPI_VERSION;
}

In my Perl module's XS file, I have:

char *
wiringPiVersion()

...and my Perl module's Makefile.PL

LIBS => ['-lwiringPi'],

...and after re-installing the Perl module, I can access the function without any issues in a test script.

I'm hoping this is something simple I'm overlooking which someone may be able to point out. My question is, how do I rectify this?