no-reply@allegro.cc (o______o) — Sun, 22 Jan 2017 19:26:40 +0000

im new to allegro and also compiling with gcc
so, i installed allegro using the ubuntu package liballegro5-dev
now i want to compile this:

#SelectExpand
  1#include 
  2#include 
  3
  4int main(int argc, char **argv) {
  5  int res[2] = {640, 480};
  6  ALLEGRO_DISPLAY *scr;
  7  al_init();
  8  if (! al_init_primitives_addon())
  9    return 1;
 10  scr = al_create_display(res[0], res[1]);
 11  al_clear_to_color(al_map_rgb(0, 36, 86));
 12  al_draw_circle(res[0]/2, res[1]/2, res[1]/4, al_map_rgb(238, 237, 240), 5);
 13  al_flip_display();
 14  while (1);
 15  return 0;
 16}

using this line:
$ gcc -o allegro_1 -L/usr/lib/x86_64-linux-gnu -lallegro -lallegro_primitives allegro_1.c
but it fails like this:

/tmp/cc5C6cqP.o: In function `main':
allegro_1.c:(.text+0x3d): reference to `al_install_system' not defined
allegro_1.c:(.text+0x42): reference to `al_init_primitives_addon' not defined
allegro_1.c:(.text+0x75): reference to `al_create_display' not defined
allegro_1.c:(.text+0x8d): reference to `al_map_rgb' not defined
allegro_1.c:(.text+0xba): reference to `al_clear_to_color' not defined
allegro_1.c:(.text+0xce): reference to `al_map_rgb' not defined
allegro_1.c:(.text+0x141): reference to `al_draw_circle' not defined
allegro_1.c:(.text+0x146): reference to `al_flip_display' not defined
collect2: error: ld returned 1 exit status

i have no idea what is the problem here
also i dont know if i should add: #include
any help, please?

no-reply@allegro.cc (Edgar Reynaldo) — Mon, 23 Jan 2017 00:04:30 +0000

You need to link with the allegro libraries that you are using. On Linux, you do this with pkg-config.

no-reply@allegro.cc (o______o) — Mon, 23 Jan 2017 00:36:58 +0000

finally i found i should do like this:
gcc allegro_1.c -o allegro_1 `pkg-config --libs allegro-5 allegro_primitives-5 allegro_main-5`
the order is important. dependencies must go last

can't compile after installing