主机系统：Ubuntu 10.10。
交叉编译iptables-1.4.10时，出现以下错误：
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
eval: 1: libtool_args+=: not found
eval: 1: compile_command+=: not found
eval: 1: finalize_command+=: not found
解决方法：cd /bin; rm sh; ln -s bash sh
在ubuntu发行版下,查看sh命令。
$ cd /bin
$ ls -l
lrwxrwxrwx 1 root root 4 sh -> dash
实际上，sh命令链接的是dash(Debian-shell)。