[arch-general] Question about installing libraries

[Christian]

Hi all,
I am learning and learning more in Arch linux, but I have a question.
There are a few programs that I use and I am not able to find all the 
dependencies in the Arch repositories, and some of th elibraries are a 
little old and the developers have .deb packages for them.
So my question is if I get a such package, may I just extract it, unpack 
the data.tar.gz and copy the libraries into /usr/lib?
For example, I now need to use pygame1.8 and there is 1.9 in the arch 
repository.
What do you think?
Many thanks,
Christian