1. Clone wallet sources

git clone https://github.com/grumpbyguy/NicNacCoinwallet.git

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

ln -s ../NicNacCoin NicNacGui

Alternative way is to create git submodule:

git submodule add https://github.com/grumpbyguy/NicNacCoin.git cryptonote

3. Build

mkdir build
cd build
cmake -G "Visual Studio 12 Win64" ..

And then do Build.

In 'build' folder solution for Visual Studio will be created
Open in with Visual Studio and make build there