As delinkx already said, it has to be
Code:
#include "player.c"


Another thing:
Your action won't do anything because of:
Code:
(...)
while(key_w);
(...)


If you want movement depending on the W key:
Code:
while(me)
{
  c_move(me, nullvector, vector(15 * key_w * time_step, 0, 0), GLIDE);

  wait(1);
}