To compile homebrew for the Wii U, you need the devkitPro Toolchain, the offical “getting started” can be found here.
Windows
On Windows you can use the graphical installer to install devkitpro.
After installing you can open MSYS (Start -> devkitPro -> MSYS) and check if the needed packages are installed and on the newest version.
pacman -Syu devkitPPC --needed
pacman -Syu devkitARM --needed
pacman -Syu general-tools --needed
# We need xxd for building the plugin loader
pacman -Syu vim
Make sure the following environment variables are set:
DEVKITPRO=/opt/devkitpro
DEVKITARM=/opt/devkitpro/devkitARM
DEVKITPPC=/opt/devkitpro/devkitPPC
Unix
The offical installation guide can be found here
Basically you need to grab the newest devkitpro pacman version and install the devkitPPC, devkitARM , general-tools and vim (for xxd) package.
Example commands for installing:
# Download newest deb file. (URL might be outdated in the future)
wget https://github.com/devkitPro/pacman/releases/download/devkitpro-pacman-1.0.1/devkitpro-pacman.deb -O /tmp/devkitpro-pacman.deb
# Install it
sudo dpkg -i /tmp/devkitpro-pacman.deb
# Install needed packages
sudo dkp-pacman -Syu devkitPPC --needed
sudo dkp-pacman -Syu devkitARM --needed
sudo dkp-pacman -Syu general-tools --needed
# We need xxd for building the plugin loader
pacman -Syu vim
After installing, make sure the following environment variables are set:
DEVKITPRO=/opt/devkitpro
DEVKITARM=/opt/devkitpro/devkitARM
DEVKITPPC=/opt/devkitpro/devkitPPC
Pacman information
More information on how to use pacman can be found here