Any special situation for you to want your wallet IN your rapberry?
A wallet doesn't need to be in a physical machine, actually it can be in a sheet of paper (cold wallet). So if you don't need your server to do anything special with those coins you can just create a paper wallet, and if what you really want is to check if you receive coins, you only have to check from your raspberry your wallet's public key in blockchain to see how many coins has it received.
If you want to create a wallet, you can use vanitygen. Keep the public and private keys in a safe place and you are ready to go. The day you need to move those coins you will need to install bitcoin-qt wherever you want and import your private key to the default wallet created by bitcoin-qt. Once you've done that you can operate with your coins from that place.
Do you trust third party services to report your payments? – David Schwartz – 2015-01-26T01:28:00.903
@DavidSchwartz I would rather not but if I have to I will to get it working – user2189362 – 2015-01-26T05:38:32.817
2Then you can use a service like blockchain.info to detect payments. Use a cold wallet to receive them. – David Schwartz – 2015-01-26T08:58:41.537
@DavidSchwartz Ok that works for me can you write a full answer explaining it completely? – user2189362 – 2015-01-27T01:04:08.640
When you say web server I'm assuming like a LAMP server that host websites. I'm aware that there are different types of servers but web server makes me think of a LAMP like server. That being said why don't you just use a bitcoin address from a wallet from another computer and put it on the website – Ben P. Dorsi-Todaro – 2015-01-28T18:15:41.420
@BenP.Dorsi-Todaro Yes it is a LAMP server. Your method won't work because I need to verify the identity of the person who transfers the money so I can be sure that they paid. – user2189362 – 2015-01-29T02:50:53.190
If you have sqlite on the server you can store multiple addresses in the database, create simple login system that assigns an address from the one table to each user who logins in. – Ben P. Dorsi-Todaro – 2015-02-01T14:54:26.903