If » PEAR is available on your *nix-like
system you can use the pear installer to install the xattr extension, by the
following command: pear -v install xattr.
You can always download the tar.gz package and install xattr by hand:
Example #1 xattr install by hand
gunzip xattr-xxx.tgz
tar -xvf xattr-xxx.tar
cd xattr-xxx
phpize
./configure && make && make install