libmcrypt libconv mhash ./configure --prefix=/usr/local
mcrypt 安装完成后在当前目录还要 /sbin/ldconfig
./configure --enable-ltdl-install
安装完成mhas
ln -s /usr/local/lib/libmcrypt.la /usr/lib/libmcrypt
安装mcryp 要先识别libmcryp
ftp://mcrypt.hellug.gr/pub/crypto/mcrypt/libmcrypt/libmcrypt-2.5.3.tar.gz
原文：http://www.cnblogs.com/php-linux/p/5375067.html