2、下載libmcrypt（安裝mcrypt需要此軟件包）
http://nchc.dl.sourceforge.net/project/mcrypt/Libmcrypt/2.5.8/libmcrypt-2.5.8.tar.gz
3、下載mhash（安裝mcrypt需要此軟件包）
https://acelnmp.googlecode.com/files/mhash-0.9.9.9.tar.gz
4、下載mcrypt
https://lcmp.googlecode.com/files/mcrypt-2.6.8.tar.gz
二、安裝軟件包
1、安裝libmcrypt
cd /usr/local/src
tar zxvf libmcrypt-2.5.8.tar.gz
cd libmcrypt-2.5.8
./configure
make
make install
sleep 2
/sbin/ldconfig
cd libltdl/
./configure --enable-ltdl-install
make
make install
cd ../../
2、安裝mhash [加密擴展庫]
cd /usr/local/src
tar zxvf mhash-0.9.9.9.tar.gz
cd mhash-0.9.9.9
./configure
make
make install
sleep
cd ../
rm -f /usr/lib64/libmcrypt.*
rm -f /usr/lib64/libmhash*
ln -s /usr/local/lib64/libmcrypt.la /usr/lib64/libmcrypt.la
ln -s /usr/local/lib64/libmcrypt.so /usr/lib64/libmcrypt.so
ln -s /usr/local/lib64/libmcrypt.so.4 /usr/lib64/libmcrypt.so.4
ln -s /usr/local/lib64/libmcrypt.so.4.4.8 /usr/lib64/libmcrypt.so.4.4.8
ln -s /usr/local/lib64/libmhash.a /usr/lib64/libmhash.a
ln -s /usr/local/lib64/libmhash.la /usr/lib64/libmhash.la
ln -s /usr/local/lib64/libmhash.so /usr/lib64/libmhash.so
ln -s /usr/local/lib64/libmhash.so.2 /usr/lib64/libmhash.so.2
ln -s /usr/local/lib64/libmhash.so.2.0.1 /usr/lib64/libmhash.so.2.0.1
ln -s /usr/local/bin/libmcrypt-config /usr/bin/libmcrypt-config
#32位系統 lib64換成lib
3、安裝mcrypt
cd /usr/local/src
tar zxvf mcrypt-2.6.8.tar.gz
cd mcrypt-2.6.8
ln -s /usr/local/bin/libmcrypt_config /usr/bin/libmcrypt_config #添加軟連接
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH #添加環境變量
./configure
make
make install
或者 老男孩
tar zxvf mcrypt-2.6.8.tar.gz
cd mcrypt-2.6.8
/sbin.ldconfig
./configure LD_LIBRARY_PATH==/usr/local/lib
make
make install