git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=`pwd`/depot_tools:"$PATH"
fetch v8
cd v8
git checkout [Commit hash]
gclient sync -D
git apply [diff patch]
./build/install-build-deps.sh
sudo apt-get install ninja-build
ninja-build 없으면 깔아줘야된다.
./tools/dev/gm.py [config]
config : x64.debug
, x64.release