I'm having trouble compiling with the skeleton environment. I was able to successfully compile the Ndless demo, whereas Bwang's raycaster and a small test program I wrote won't compile. It seems to not be loading the headers properly.

Here is the code:
#include <os.h>
#include <common.h>
#include <utils.h>

asm(".string \"PRG\"\n");

int main()

{
  int antx = 160;
  int anty = 120;
  int dir = 1;
 
  while (!isKeyPressed(KEY_NSPIRE_ESC)) {
    if (getpixel(antx,anty) == 15) {
      setpixel(anty,antx,0);
      dir = dir - 1;
      }
    else {
      setpixel(anty,antx,15);
      dir = dir + 1;
      }
    if (dir == 0)
      dir = 4;
    else if (dir == 5)
      dir = 1;
    if (dir == 1)
      antx = antx - 1;
    else if (dir == 2)
      anty = anty + 1;
    else if (dir == 3)
      antx = antx + 1;
    else
      anty = anty - 1;
    if (antx == 0)
      antx = 320;
    else if (antx == 321)
      antx = 1;
    if (anty == 0)
      anty = 240;
    else if (anty ==  241)
      anty = 1;
   }
   return 0;
}

And the the full output:
arm-elf-gcc -mcpu=arm7tdmi -O3 -Wall -W -fpie -fno-merge-constants -c -I./header
s -D NON_CAS main.c
In file included from ./headers/os.h:17,
                 from main.c:1:
./headers/common.h:62:20: warning: missing whitespace after the macro name
./headers/common.h:71:22: warning: missing whitespace after the macro name
./headers/common.h:114:20: warning: missing whitespace after the macro name
./headers/common.h:114:1: warning: "KEY_NSPIRE_" redefined
./headers/common.h:62:1: warning: this is the location of the previous definitio
n
./headers/common.h:116:20: warning: missing whitespace after the macro name
./headers/common.h:116:1: warning: "KEY_NSPIRE_" redefined
./headers/common.h:114:1: warning: this is the location of the previous definiti
on
main.c: In function 'setPixel':
main.c:23: warning: implicit declaration of function 'getpixel'
main.c:24: warning: implicit declaration of function 'setpixel'
main.c:52: warning: 'return' with a value, in function returning void
main.c: In function 'main':
main.c:53: error: expected declaration or statement at end of input
make: *** [main.o] Error 1

If it matters, I'm using the arm-elf-gcc version of yagarto.