wget ftp://mcrypt.hellug.gr/pub/crypto/mcrypt/attic/libmcrypt/libmcrypt-2.5.7.tar.gz
安装：
66 tar -zxvf libmcrypt-2.5.7.tar.gz
67 cd libmcrypt-2.5.7
68 mkdir -p /usr/local/libmcrypt
69 ./configure prefix=/usr/local/libmcrypt/
70 make
71 make install
记得之后重新./configure的时候要加上/usr/local/libmcrypt
安装php出错configure: error: mcrypt.h not found. Please reinstall libmcrypt
原文：http://www.cnblogs.com/sooflow/p/4495464.html