If you are using Symfony 2.1 on -say- CentOS, you might end up getting the unfamous exception The country resource bundle could not be loaded for locale "%s"
Basically Symfony 2.1 uses version 49 of ICU, but some distributions (CentOS at least) only provide version 4.2!
There's been some discussion about the subject already : symfony/symfony#5279,
but the easy solution of running php vendor/symfony/symfony/src/Symfony/Component/Locale/Resources/data/build-data.php 4.2 requires you to have (WTF) Subversion installed on your machine/server.
Rather than doing so, grab the tarball of the compiled files form here : https://github.com/kbsali/sf2-icu/tarball/master and unpack it in vendor/symfony/symfony/src/Symfony/Component/Locale/Resources/data/
Hope this helps.
Any other version needed?
You could do something like that (kbsali-sf2-icu-XXXX depends on the sha of the last commit) :
wget https://github.com/kbsali/sf2-icu/tarball/master -O sf2-icu.tgz
tar xzvf sf2-icu.tgz
mv kbsali-sf2-icu-XXXX/4.2 vendor/symfony/symfony/src/Symfony/Component/Locale/Resources/data/
rm -rf kbsali-sf2-icu-XXXX sf2-icu.tgz