Well, last night I compiled the package successfully.
For those who are interested, I had to edit my mirrorlist file in etc/pacman.d/
Some Google research did the trick.
I had to download lib32-smpeg and lib32-sdl_mixer compiled packages.
Then I tried to install them. Each time a package was not found in the servers of my mirrorlist, I did a search in google for it and added the new servers containing the files to my mirrorlist.
When smpeg and sdl_mixer were installed, I tried to compile the SORR package.
Again there were some files not found in the servers, so I had to repeat the same proccess described above.
Here's a my mirrorlist
Server = http://ftp.seblu.net/archlinux/$repo/os/$arch
Server = http://mirror.transip.net/archlinux/$repo/os/$arch
Server = http://www.mirrorservice.org/sites/ftp.archlinux.org/$repo/os/$arch
Server = http://www.mirrorservice.org/sites/ftp.archbsd.net/$repo/os/$arch
Server = http://gaming.jhu.edu/mirror/archlinux/$repo/os/$arch
Server = http://ftp.nluug.nl/os/Linux/distr/archlinux/$repo/os/$arch
Server = http://tux.rainside.sk/archlinux/$repo/os/$arch
Server = http://mirrors.manchester.m247.com/arch-linux/$repo/os/$arch
Server = http://ftp.uni-erlangen.de/archlinux/$repo/os/$arch
Server = http://mirrors.azc.uam.mx/mirrors/archlinux/$repo/os/$arch
Server = http://mirror.gnomus.de/$repo/os/$arch
Server = http://archlinux.polymorf.fr/$repo/os/$arch
Server = http://ftp.nluug.nl/os/Linux/distr/archlinux/$repo/os/$arch
Server = http://mirror.one.com/archlinux/$repo/os/$arch
Server = http://mirror.bpiotrowski.pl/archlinux/$repo/os/$arch
Server = http://mirror.nl.leaseweb.net/archlinux/$repo/os/$arch
Server = http://mirror.us.leaseweb.net/archlinux/$repo/os/$arch
Server = http://mirror.de.leaseweb.net/archlinux/$repo/os/$arch
Server = http://arch.tamcore.eu/$repo/os/$arch
Server = http://ftp.tuxdroid.org/archlinux/$repo/os/$arch
Server = http://mirror.chmuri.net/archmirror/$repo/os/$arch
Server = http://mirror.js-webcoding.de/pub/archlinux/$repo/os/$arch
Server = http://archlinux.limun.org/$repo/os/$arch
The libraries used by this game are not present in most servers...first time I tried with more than 10 servers at the top of the rank with 100% completion, and I had a "not found" error in all of them.
Once I compiled the package, I installed it and tested. It works perfectly.
Only drawback is that I must play it under LXDE desktop, because my gamepad axes aren't detected under AdvMenuPlus...so I must use Rejoystick to map the axes to the keyboard.
Had a very fun gaming night untill 5AM

.
Hope this may be usefull to someone in the future.
Regards.