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EDIT: I used the command: g++ hello.cpp -o hello `pkg-config --cflags --libs allegro-5 allegro_main-5`

And it worked. I am not sure how so please feel free to explain
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Hello!

I followed to steps to build and install Allegro 5 from their wiki (found here: https://wiki.allegro.cc/index.php?title=Main_Page) and seemingly succeeded with no problems.

allegro was installed to the following (as the wiki suggests) /usr/local/include and usr/local/lib and I have confirmed allegro is there.

I then wrote the following code in vim:

#include <stdio.h>
#include <allegro5/allegro.h>

int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display = NULL;

if(!al_init())
{
fprintf(stderr, "failed to initialize allegro!\n");
return -1;
}

display = al_create_display(640, 480);

if(!display)
{
fprintf(stderr, "failed to create display!\n");
return -1;
}

al_clear_to_color(al_map_rgb(0,0,0));
al_flip_display();
al_rest(10.0);
al_destroy_display(display);

return 0;
}

I am new to using Unix and have only ever compiled c++ programs with g++ that were simple hello world files with no libraries needed.

Therefore after searching around on the internet I tried the following commands:

g++ hello.cpp -o hello `pkg-config --libs allegro-5`

resulting in the following:

Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
(maybe you meant: __al_mangled_main)
ld: symbols not found for architecture x86_64
clang: error: linker command failed with exit code 1

BTW, I used homebrew to install dependencies instead of macports

brew install pkg-config brew install zlib etc...

I think its a problem with things not being linked.

What am I doing wrong?