To build a .pkg installer (for macOS) for your C program (fetch_addr), we’ll follow this outline:

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✅ Prerequisites (macOS):

1. Xcode Command Line Tools (for gcc, pkgbuild, etc.)

xcode-select --install

2. Homebrew dependencies:

brew install curl cjson

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✅ Step 1: Save and Compile fetch_addr.c

Create fetch_addr.c from the code above, then compile:

gcc fetch_addr.c -o fetch_addr -lcurl -lcjson

You should now have a binary called fetch_addr.

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✅ Step 2: Create the macOS .pkg Structure

Make a clean package layout:

mkdir -p pkg_root/usr/local/bin
cp fetch_addr pkg_root/usr/local/bin/

Set permissions:

chmod 755 pkg_root/usr/local/bin/fetch_addr

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✅ Step 3: Build the .pkg

Use pkgbuild to make a simple installer:

pkgbuild \
  --identifier com.yourname.fetchaddr \
  --version 1.0.0 \
  --install-location /usr/local/bin \
  --root pkg_root \
  fetch_addr.pkg

This will generate fetch_addr.pkg in the current directory.

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✅ Done!

Now you can run the .pkg installer on any macOS system. After install, fetch_addr will be available in terminal via:

fetch_addr

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📦 Optional Enhancements

If you want:

• A prettier GUI installer: Use productbuild + distribution.xml
• To notarize and sign: You'll need an Apple Developer ID and codesigning tools

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