Поменьше размером нет?
Статический меньше не будет
В догонку
make defconfig - Create the maximum "sane" configuration. This enables almost all features, minus things like debugging options and features that require changes to the rest of the system to work (such as selinux or devfs device names). Use this if you want to start from a full-featured Busybox and remove features until it's small enough.
make allnoconfig - Disable everything. This creates a tiny version of Busybox that doesn't do anything. Start here if you know exactly what you want and would like to select only those features.
make menuconfig - Interactively modify a .config file through a multi-level menu interface. Use this after one of the previous two.
Some other configuration options are:
make oldconfig - Update an old .config file for a newer version of Busybox.
make allyesconfig - Select absolutely everything. This creates a statically linked version of Busybox full of debug code, with dependencies on selinux, using devfs names... This makes sure everything compiles. Whether or not the result would do anything useful is an open question.
ну и
LDFLAGS="--static" make