git config remote.origin.prune true

git config --global fetch.prune true

[fetch]
    prune = true

git config remote.origin.prune true
                 #^^^^^^
                 #replace with your repo name

[remote "origin"]
    url = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    fetch = +refs/heads/*:refs/remotes/origin/*
    prune = true

git config --global gui.pruneDuringFetch true

[gui]
    pruneDuringFetch = true

[alias]
pfetch = fetch --prune