1. Clone wallet sources

git clone https://github.com/tr4nscr1pt/KMC-GUI-wallet.git

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

ln -s ../ cryptonote

Alternative way is to create git submodule:

git submodule add https://github.com/tr4nscr1pt/KMC-GUI-wallet.git cryptonote

3. Build

mkdir build && cd build && cmake .. && make