field has incomplete type

I am trying to port a program. The complier says 'field "pointer" has incomplete type

typedef struct dc6header_s
{

long version; // 06000000
long unknown01; // 01000000
long unknown02; // 00000000
byte termination[4];// EEEEEEEE or CDCDCDCD
long unknown03; // 10000000
long blockcount; // 10000000
// after this, are pointers
long pointer[]; //<------------here

} dc6header;

how can I fix this?

Sounds like your compiler isn't fully C99 compatible. I've done the same thing here with no trouble.

I am trying to compile it on os X do you have any suggestions it uses gcc

Specify the size of the array named pointer, eg
>long pointer[100];
or if you want a pointer instead of an array:
>long *pointer;

Did you try this?

Code:

---

gcc -std=c99 ...

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If all else fails you could use the gcc extension Arrays of Length Zero

Btw, your code compiles fine on GCC 3.3 even without -std=c99. Maybe older version default to a different standard.