Compile vim
من ويكي عربآيز
Compiling VIM with Arabic Support
As of VIM 6.2 you do not need to grab patches and get involved in hair compilation processes. However, it is still not intuitive to add Arabic support to VIM.
The Process
$ configure --enable-multibyte --with-features=big $ make $ make install
That's all there is to it -- but where were you going to guess those two configure options from?