Arch LinuxでFlutter環境構築で「clang++ is required for Linux development.」となる

Arch LinuxでFlutter環境構築中に微詰まりしたのでメモ。

事象

最初の環境構築時、flutter doctorで以下の事象が発生。

❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.4, on EndeavourOS 6.9.2-arch1-1, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✗] Linux toolchain - develop for Linux desktop
    ✗ clang++ is required for Linux development.
      It is likely available from your distribution (e.g.: apt install clang), or can be downloaded from https://releases.llvm.org/
    ✗ CMake is required for Linux development.
      It is likely available from your distribution (e.g.: apt install cmake), or can be downloaded from https://cmake.org/download/
[✓] Android Studio (version 2021.3)
[✓] Android Studio (version 2023.1)
[✓] Connected device (1 available)
[✓] Network resources

! Doctor found issues in 2 categories.

ためしにflutter runをしてみると、以下のエラーが発生。

❯ flutter run
Downloading linux-x64-debug/linux-x64-flutter-gtk tools...       2,288ms
Downloading linux-x64-profile/linux-x64-flutter-gtk tools...      1,514ms
Downloading linux-x64-release/linux-x64-flutter-gtk tools...      1,598ms
Launching lib/main.dart on Linux in debug mode...
Building Linux application...
Traceback (most recent call last):
  File "/home/user/.local/bin/cmake", line 5, in <module>
    from cmake import cmake
ModuleNotFoundError: No module named 'cmake'
Error: Unable to generate build files

python側にcmakeが必要そうなので、pipでインストール。

pip install cmake

再実行すると、以下のエラーに変わる。

/usr/bin/clang++: error while loading shared libraries: libLLVM.so.18.1: cannot open shared object file: No such file or directory

libLLVMの構築に失敗している？sudo pacman -S llvm ですでにインストール自体はしていたが、どうやらllvm-libsが必要とのこと。

再インストールしたところ、解消した。

対応について

結局のところ、以下の2つでエラーは取れた。

pip install cmake
sudo pacman -S llvm-libs