To get started with the building process, you'll need to get familiar with Git and Repo.

Prepare Your Environment:

sudo apt install git-core gperf bc bison build-essential ccache curl flex g++-multilib gcc-multilib git gnupg gperf imagemagick
lib32ncurses5-dev lib32readline-dev lib32z1-dev liblz4-tool libncurses5-dev libsdl1.2-dev libssl-dev libwxgtk3.0-dev libxml2
libxml2-utils lzop pngcrush rsync schedtool squashfs-tools xsltproc libc6-dev-i386 x11proto-core-dev libx11-dev libgl1-mesa-dev
zip unzip zlib1g-dev -y

Install Repo:

mkdir -p ~/bin
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
chmod a+x ~/bin/repo

To initialize your local repository, use a command like this:

repo init -u https://github.com/Project-Titanium/manifest.git -b 10.0

Then to sync up:

repo sync --force-sync --no-tags --no-clone-bundle -j$(nproc --all)

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Compilation of ProjectTitanium

From root directory of the ROM, perform following commands in terminal

source build/envsetup.sh

lunch pti_<codename>

brunch <codename>