CentOS: make menuconfig error: curses.h: No such file or directory

the problem when use centos5 to build kernel or busybox

step 1. Centos中关于 ncurses.h:no such file or directory错误的问题 http://blog.sina.com.cn/s/blog_9f1c09310101a668.html
原因是系统中没有安装ncurses这个库函数，从网上查了个能在Centos上解决这个问题的安装方式：

yum install ncurses-devel ncurses

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step 2. ( skip it if step 1 success.)

Public key for mysql....rpm is not installed /article/2218269.html
When I exucute "yum install ncurses-devel ncurses", it shown that: "Public key for xxx.rpm(I didn't remember the name) is not installed".Then I excute "rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5" to import the key, then exucute "yum install ncurses-devel ncurses" again, the tool installed successfully. Then I "make menuconfig" in busybox or linux kernel source code, it works ok.