If you are confused on how to start developing for PS2, see the getting started section on the ps2dev main page.

This program will automatically build and install the compiler tools used in the creation of homebrew software for the Sony PlayStation® 2 videogame system.

These scripts download (with git clone) and install:

• ps2toolchain-dvp
• ps2toolchain-iop
• ps2toolchain-ee

1. Install gcc/clang, make, patch, git, texinfo, flex, bison, gsl, gmp, mpfr, mpc and gettext if you don't have those packages.
2. Ensure that you have enough permissions for managing PS2DEV location (which defaults to /usr/local/ps2dev). PS2DEV location MUST NOT have spaces or special characters in it's path! For example, on Linux systems, you can set access for current user by running commands:

export PS2DEV=/usr/local/ps2dev
sudo mkdir -p $PS2DEV
sudo chown -R $USER: $PS2DEV

3. Add this to your login script (example: ~/.bash_profile)

export PS2DEV=/usr/local/ps2dev
export PS2SDK=$PS2DEV/ps2sdk
export PATH=$PATH:$PS2DEV/bin:$PS2DEV/ee/bin:$PS2DEV/iop/bin:$PS2DEV/dvp/bin:$PS2SDK/bin

4. Run toolchain.sh ./toolchain.sh

Links for discussion and chat are available here.