I tried to open the guide page in http://www.allegro.cc/files/install-devcpp.html, but I coundnt open it.

I havent used allegro for months and I forgot how to install it.

my system is XP and I use dev c++

I have unzipped the all422.zip and copied all the file to d:\dev-cpp
I have added command "-lalleg" in complier option

but it still doesnt work, error msg says can not find "-lalleg"

Anyone can help me?
Thank you~!

Try the wiki page for using dev-cpp.
Setting up Dev-Cpp for Allegro

- Edit -
The url you posted was not found on the server (404 error) , was there a bad link somewhere?

Find the "liballeg.a" file, usually under "/allegro/lib/mingw32"

I cant find liballeg.a

You can't find the library because it has not been compiled / installed yet.

You can either install a dev-pack for Allegro or you can build the library yourself.

Read the file mingw32.txt in your allegro\docs\build directory , this will tell you how to build Allegro yourself.
Make sure to read these sections :
============ Setting up Dev-C++ to build Allegro ============

============ Installing Allegro ============

============ Using Allegro ============

============ Creating a program with Dev-C++ ============