Greetings, Alexey.

On 5 декабря 2006 г., 12:29:24 you wrote:
  

2. Compile the module itself using PECL. This one should be much more
easier and faster.
    

Some more on it. This extension is not available separatelly from PHP5
source distribution. So you'll need fetch php sources from php.net,
extract them somewhere, head on to <sources_dir>/ext/ and copy
somewhere mcrypt folder.
Then you should go to that folder, run from there:
# phpize
# ./configure
# make
# make install-modules

It should be compiled and placed to your PHP_EXT dir. After that head
on to a place in PHP configs where shared extensions get loaded and
include there mcrypt.so.
You should be done.