Exactly what you think it is, an SDK (software development kit) for creating homebrew on the vita.
Follow the steps at https://vitasdk.org/
However, if you still somehow don’t get what to do, Here is a detailed guide below.
1.Inside of your Linux terminal (or WSL), type in
apt-get install make git-core cmake python
This will install Python to Ubuntu, allowing you to run the VitaSDK install script
nano .bashrc on your terminal. If you have trouble opening it, google a guide on opening this file.
3.Scroll to the bottom of the whole text (make sure to not delete anything!) and once you reach the end, paste in the following:
export VITASDK=/usr/local/vitasdk export PATH=$VITASDK/bin:$PATH # add vitasdk tool to $PATH
4.Press Ctrl+S and Ctrl+X
5.Run the following commands in order:
git clone https://github.com/vitasdk/vdpm cd vdpm ./bootstrap-vitasdk.sh ./install-all.sh
This will clone the VitaSDK Installation scripts (vdpm) onto your computer and run them.
After the lengthy install, you will have sucessfully installed VitaSDK!