Building Busybox

First cd into the $MYBOOT/busybox-0.60.5 subdirectory.

Edit the file Conf.h as follows:

• Add or remove support for programs you do or do not want. For each program there is a #define BB_XXX line that can be commented out or not. I uncommented the following lines, some of these commands are expected to be useful in install scripts, others are necessary for network access or modules and of course I wanted the vi editor: BB_CMP, BB_EXPR, BB_IFCONFIG, BB_INSMOD, BB_PING, BB_RMMOD, BB_ROUTE, BB_VI and BB_WGET.
• Add or remove features that you do or do not want by uncommenting or commenting th corresponding feature line. I uncommented the following: BB_FEATURE_USE_TERMIOS, BB_FEATURE_MOUNT_NFSMOUNT and BB_FEATURE_IFCONFIG_STATUS.

Edit the Makefile as follows:

• Uncomment the CC= line below the comment about uClibc and change it to CC=${MYBOOT}/uclibc-dev/bin/gcc
• You could enable LFS support, as it is already selected in uClibc as well.

Now build the program.

make
make PREFIX=$MYBOOT/rootfs install

Because you have linked with the dynamic uClibc library and these are not installed in the host system's /lib directory, the program cannot run. There is a trick to work around it: by using the chroot command, you can run a program whose root directory is the specified directory. Become root and type the following command:

/usr/sbin/chroot $MYBOOT/rootfs /bin/sh

The shell that you are now in is the shell inside the $MYBOOT/rootfs directory. This shell thinks that this rootfs directory is in fact the root directory: even the shared libraries of uClibc in the /lib directory will be found. Type the command ls / and it will be clear. Exit the chroot subshell with Control-D and everything will be back to normal.

Now you have most common Unix utilities including an editor and a shell and you've spent only 614kB of disk space!