message: Update build instructions about Homebrew Rust bug
diff: @@ -46,7 +46,8 @@ makepkg -isr
  ### Prerequisites
  -1. Install [`rustup.rs`](https://rustup.rs/)
  +1. Install [`rustup.rs`](https://rustup.rs/). **DO NOT** use the Homebrew Rust
  + compiler on macOS (see FAQ for explanation).
  2. Clone the source code:
  @@ -188,6 +189,9 @@ Just Works.
  ## FAQ
  +- _proc-macro derive panicked during macOS build; what's wrong?_ There's an
  + issue with the Rust compiler from Homebrew. Please follow the instructions
  + and use `rustup`.
  - _Is it really the fastest terminal emulator?_ In the terminals I've
  benchmarked against, alacritty is either faster, WAY faster, or at least
  neutral. There are no benchmarks in which I've found Alacritty to be slower.
  