mac os x的CMake 2.8.10安装失败

I am updating Cmake in my Mac Book pro with OS X Lion 10.7.5. The old version of Cmake is 2.8.8 and the new one is 2.8.10. When I run almost to the end of the installation process, the installer prompts for creating a Symlink to /usr/bin of several tools. After click on continue, the installer throws an exception telling that couldn't create symlinks. Previously of the process, I've moved to trash the old version of Cmake and then using finder I got nothing more files of Cmake on the machine. Any idea how Can I complete the installation succesfully?I am updating Cmake in my Mac Book pro with OS