update readme with build instructions

README.md

@@ -10,7 +10,36 @@ The Asahi Linux installer is distributed under the MIT license. See LICENSE for
 
 This installer vendors [python-asn1](https://github.com/andrivet/python-asn1), which is distributed under the same license.
 
-## Building
-
-`./build.sh`
-
+## Building on macOS
+### Build Requirements
+Install and setup `Xcode Command Line Tools` from Apple
+```bash
+xcode-select --install
+```
+Install and setup [`Homebrew`](https://brew.sh/), "The Missing Package Manager for macOS"
+```bash
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+```
+Install [Rust and Cargo](https://doc.rust-lang.org/cargo/getting-started/installation.html):
+```bash
+# follow the installer instructions
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+# afterwards initialize
+source "$HOME/.cargo/env"
+```
+
+### Build Asahi Installer locally
+```bash
+git clone --recursive https://github.com/AsahiLinux/asahi-installer.git
+cd ./asahi-installer
+./build.sh
+```
+
+### FAQ Errors
+```bash
+# Error: Rust dependency not found
+error: failed to load source for dependency `bitflags`
+# Solution: download rust cargo dependencies for m1n1
+git submodule init
+git submodule update
+```

build.sh

@@ -24,6 +24,15 @@ rm -rf "$PACKAGE"
 mkdir -p "$DL" "$PACKAGE" "$RELEASES" "$RELEASES_DEV"
 mkdir -p "$PACKAGE/bin"
 
+echo "Install brew dependencies..."
+for BREW_DEPENDENCY in "wget" "make" "llvm"; do
+    echo "Brew install $BREW_DEPENDENCY..."
+    if brew ls --versions "$BREW_DEPENDENCY"
+    then brew upgrade "$BREW_DEPENDENCY"
+    else brew install "$BREW_DEPENDENCY"
+    fi
+done
+
 echo "Determining version..."
 
 VER=$(git describe --always --dirty --tags)