how to resolve compilation errors when building on wsl2 Ubuntu-22.04

[csmyx]

Hi, I m a zig noob. I‘m trying to build this on wsl2 Ubuntu-22.04，but when I build with zig-0.9.1 on tag v0.2, I got whese compile errors:

❯ zig version
0.9.1
❯ zig build
/home/hugo/zig_repos/pluto/build.zig:88:11: error: unused local constant
    const build_mode_str = switch (build_mode) {
             ^
❯ zig build
./build.zig:56:9: error: no member named 'addBuildOption' in struct 'std.build.LibExeObjStep'
    exec.addBuildOption(TestMode, "test_mode", test_mode); 

For the first error， I just add a line "_ = build_mode_str;" to depress the const restriction. but I don't known why is this happening.

As for the second error, I don't know how to fix it and Why is this happening？It seems to be related to zig lib api updates, but I'm clearly using the correct version zig 0.9.1.