tar-tree.c dereferencing pointer to incomplete type

[白い熊]

Hello:

I'm building v 1.8.1.1 on Android. The build chokes on the builtins
phase on tar-tree.c with:

    CC builtin/tar-tree.o
builtin/tar-tree.c: In function 'cmd_get_tar_commit_id':
builtin/tar-tree.c:93:12: error: dereferencing pointer to incomplete type
make: *** [builtin/tar-tree.o] Error 1

The line that's causing this in tar-tree.c is:

if (header->typeflag[0] != 'g')

from

int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
{
        char buffer[HEADERSIZE];
        struct ustar_header *header = (struct ustar_header *)buffer;
        char *content = buffer + RECORDSIZE;
        ssize_t n;

        if (argc != 1)
                usage(builtin_get_tar_commit_id_usage);

        n = read_in_full(0, buffer, HEADERSIZE);
        if (n < HEADERSIZE)
                die("git get-tar-commit-id: read error");
        if (header->typeflag[0] != 'g')
                return 1;
        if (memcmp(content, "52 comment=", 11))
                return 1;

        n = write_in_full(1, content + 11, 41);
        if (n < 41)
                die_errno("git get-tar-commit-id: write error");

        return 0;
}

But why?

What's messed up with my setup.

I can compile no probs on other machines. I'm trying to get my head
round this, but don't see the problem?
-- 
白い熊
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