Install clang first.

1. Clone this repo:

   rm -rf package/helloworld
   git clone --depth=1 https://github.com/fw876/helloworld.git package/helloworld

2. Pull upstream commits:

   git -C package/helloworld pull

• Remove

  rm -rf package/helloworld

1. Add new submodule:

   rm -rf package/helloworld
   git submodule add -f --name helloworld https://github.com/fw876/helloworld.git package/helloworld

2. Pull upstream commits:

   git submodule update --remote package/helloworld

• Remove

  git submodule deinit -f package/helloworld
  git rm -f package/helloworld
  git reset HEAD .gitmodules
  rm -rf .git/modules{/,/package/}helloworld

1. Add new feed:

   sed -i "/helloworld/d" "feeds.conf.default"
   echo "src-git helloworld https://github.com/fw876/helloworld.git" >> "feeds.conf.default"

2. Pull upstream commits:

   ./scripts/feeds update helloworld
   ./scripts/feeds install -a -f -p helloworld

• Remove

  sed -i "/helloworld/d" "feeds.conf.default"
  ./scripts/feeds clean
  ./scripts/feeds update -a
  ./scripts/feeds install -a

You have to manually upgrade Golang toolchain to 1.21 or higher to compile Xray-core.