1. Clone wallet sources

git clone https://github.com/cryptonotefoundation/cryptonotewallet.git

2. Modify CryptoNoteWallet.cmake

set(CN_PROJECT_NAME "furiouscoin")
set(CN_CURRENCY_DISPLAY_NAME "FuriousCoin")
set(CN_CURRENCY_TICKER "XFC")

3. Set symbolic link to coin sources at the same level as src. For example:

ln -s ../cryptonote cryptonote

Alternative way is to create git submodule:

git submodule add https://github.com/cryptonotefoundation/cryptonote.git cryptonote

Replace URL with git remote repository of your coin.

4. Build

mkdir build && cmake .. && make