Hi guys i'm having a project for the university in which (above others ) i have to get the minix os version from kernell call.I'm not a very experienced programmer so this is what i have come to (with some help )

int main (int argc, char *argv[] )
{
    char M3ca1[23];
    message ml;
    m.m_u.m_m1.m3ca1= OS_VERSION;
    char temp=_syscall(MM,69,&m);
    printf("the os version is %c\n",temp);
    return 0;
}

and i get multiple errors.IF you have any ideas it would be greatly appreciated.