remove CMakeCache.txt and rerun cmake.On Debian/Ubuntu, package name is libncurses5-dev, on Redhat and derivates it is ncurses-devel.

如果cmake提示下列错误：
......
CMake Error at cmake/readline.cmake:85 (MESSAGE):
  Curses library not found.  Please install appropriate package,
      remove CMakeCache.txt and rerun cmake.On Debian/Ubuntu, package name is libncurses5-dev, on Redhat and derivates it is ncurses-devel.
Call Stack (most recent call first):
  cmake/readline.cmake:128 (FIND_CURSES)
  cmake/readline.cmake:202 (MYSQL_USE_BUNDLED_EDITLINE)
  CMakeLists.txt:409 (MYSQL_CHECK_EDITLINE)
-- Configuring incomplete, errors occurred!


Debian/Ubuntu下需要安装libncurses5-dev；Redhat下需要安装ncurses-devel ，检查是否安装了ncurses包，如下所示，
缺少ncurses-devel包。检查和安装该包：
rpm -qa | grep ncurses
rpm -ivh ncurses-devel

安装方法、

下载地址：

http://mirror.centos.org/centos/6/os/x86_64/Packages/ncurses-devel-5.7-4.20090207.el6.x86_64.rpm

http://mirror.centos.org/centos/6/os/x86_64/Packages/ncurses-libs-5.7-4.20090207.el6.x86_64.rpm

devel安装需要依赖libs，执行以下命令：

rpm -ivh ncurses-libs-5.7-4.20090207.el6.x86_64.rpm

rpm -ivh ncurses-devel-5.7-4.20090207.el6.x86_64.rpm

安装了ncurses-devel包后，rm删除/soft/mysql-5.6.26/CMakeCache.txt，然后上述cmake重新编译，编译成功。
             
注意：
如果没有编译成功，需要重新编译，需要清除旧的对象文件和缓存信息。
# make clean
# rm -f CMakeCache.txt
# rm -rf /etc/my.cnf