PHP configure: error: mcrypt.h not found. Please reinstall libmcrypt
1 download libmcrypt
wget http://jaist.dl.sourceforge.net/project/mcrypt/Libmcrypt/2.5.8/libmcrypt-2.5.8.tar.gz
2 exact
tar -zxvf libmcrypt-2.5.8.tar.gz
3 config compile parameter
cd libmcrypt-2.5.8
./configure
4 compile and install
make && make install