[BusyBox] insmod problem, error messages with kernel 2.4

[julius]

hi
// Support insmod/lsmod/rmmod for post 2.1 kernels
//#define BB_FEATURE_NEW_MODULE_INTERFACE
//
// Support insmod/lsmod/rmmod for pre 2.1 kernels
#define BB_FEATURE_OLD_MODULE_INTERFACE

which option should be enabled and which other functions are neede ?
if i enable the first one i get QM_MODULES function not implemented
the second one gives this error : get_kernel_syms: hisax Function not 
implemented
or is theres something wrong with the isdn modules ?