###1. 下载busybox
前往 http://www.busybox.net/ 下载，或者：
cd busybox-src
wget http://www.busybox.net/downloads/busybox-1.20.0.tar.bz2
tar jxvf busybox-1.20.0.tar.bz2
###2. 编译busybox
使用默认配置来编译busybox
cd busybox-src/busybox-1.20.0
make defconfig
make menuconfig
busybox settings -->
build options -->
[]build busybox as a static binary （no shared libs）
按空格选中， 配置完成后开始执行make
make 过程中可能会出如下错误
networking/lib.a(inetd.o): In function `unregister_rpc':
inetd.c:(.text.unregister_rpc+0x20): undefined reference to `pmap_unset'
networking/lib.a(inetd.o): In function `register_rpc':
inetd.c:(.text.register_rpc+0x6a): undefined reference to `pmap_unset'
inetd.c:(.text.register_rpc+0x86): undefined reference to `pmap_set'
networking/lib.a(inetd.o): In function `prepare_socket_fd':
inetd.c:(.text.prepare_socket_fd+0x7e): undefined reference to `bindresvport'
collect2: error: ld returned 1 exit status
make: *** [busybox_unstripped] Error 1
可以看出是build inetd demon进程时出现了问题， 最简单的解决方法是
make menuconfig
Networking Utilities -->
[]inetd
按空格去掉选中
make
make install
我在ubuntu12.10上build时没有遇到其他的问题， 但是在ubuntu14.04上有
loginutils/passwd.c: In function ‘passwd_main’:
loginutils/passwd.c:104:16: error: storage size of ‘rlimit_fsize’ isn’t known
loginutils/passwd.c:188:2: warning: implicit declaration of function ‘setrlimit’ [-Wimplicit-function-declaration]
loginutils/passwd.c:188:12: error: ‘RLIMIT_FSIZE’ undeclared (first use in this function)
loginutils/passwd.c:188:12: note: each undeclared identifier is reported>for each function it appears in
loginutils/passwd.c:104:16: warning: unused variable ‘rlimit_fsize’ [-Wunused-variable]
解决的办法是:
cd busybox-src/busybox-1.20.0/include
vim libbb.h
添加一行 “#include < sys/resource.h >
make install 后会生成 _install 目录， build出来的文件都在 _install 目录里面
