Allegro 5 game won't compile with GCC - c++

Question

I'm trying to port over a game that I made using Allegro 5.0 (from Windows to a Raspberry Pi running Raspian). I installed Allegro and moved over all my source files, but when I try to compile using: *g++ -std=c++0x .cpp -o SpaceFighter $(pkg-config --libs allegro-5) I get the following:
/tmp/ccBliSky.o: In function main':
main.cpp:(.text+0x130): undefined reference toal_show_native_message_box'
main.cpp:(.text+0x160): undefined reference to al_init_font_addon'
main.cpp:(.text+0x164): undefined reference toal_init_ttf_addon'
main.cpp:(.text+0x168): undefined reference to al_init_image_addon'
main.cpp:(.text+0x1a4): undefined reference toal_load_ttf_font'
main.cpp:(.text+0x574): undefined reference to al_draw_textf'
/tmp/ccBMyqom.o: In functionMenuItem::MenuItem()':
MenuItem.cpp:(.text+0xa0): undefined reference to al_load_ttf_font'
/tmp/ccBMyqom.o: In functionMenuItem::~MenuItem()':
MenuItem.cpp:(.text+0x1ac): undefined reference to al_destroy_font'
/tmp/ccBMyqom.o: In functionMenuItem::Draw(GameTime const*)':
MenuItem.cpp:(.text+0x2fc): undefined reference to al_draw_text'
/tmp/ccKXP3ds.o: In functionPlayerShip::SetAudioSample(std::string)':
PlayerShip.cpp:(.text+0x604): undefined reference to al_destroy_sample'
PlayerShip.cpp:(.text+0x64c): undefined reference toal_load_sample'
collect2: error: ld returned 1 exit status
AND NO THIS IS NOT A DUPLICATE OF "What are undefined reference/unresolved external symbol errors? What are common causes and how to fix/prevent them?"
I know what usually causes most undefined reference errors. This question is specific to the allegro library I'm using.
Here's a bit of code (I'm obviously not going to post the whole game):
#include <allegro5/allegro.h>
#include <allegro5/allegro_native_dialog.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5/allegro_image.h>
#include <iostream>
#include "Game.h"
int main(int argc, char *argv[])
{
const char errorType[] = "Initialization Error";
const int flags = ALLEGRO_MESSAGEBOX_ERROR;
// Initialize Allegro
if (!al_init())
{
const char message[] = "Failed to initialize Allegro Library.";
//al_show_native_message_box(nullptr, "Error", errorType, message, nullptr, flags);
return -1;
}
Game game;
// Initialize a new window for gameplay.
int screenWidth = Game::GetScreenWidth();
int screenHeight = Game::GetScreenHeight();
Thanks in advance for any help!

Answer 1

Alegro divides its functionality across several modules. Your pkg-config line must include all the modules you are using. Try the following:
pkg-config --libs allegro-5 allegro_font-5 allegro_image-5 allegro_ttf-5

Answer 2

I had the same problem with the al_show_native_message_box function and I solved it by adding the following flag:
-lallegro_dialog