# Zig 0.17.0 build failure transcript

## Environment

- Zig: 0.17.0-dev.387+31f157d80 (x86_64-linux)
- Herdr: v0.6.2, commit `ede2059` (with FreeBSD patches)
- OS: Debian 13 (debby)
- Rust: stable

## Full stderr

```
pkg/wuffs/src/c.zig:1:15: error: invalid builtin function: '@cImport'
pub const c = @cImport({
              ^~~~~~~~
build.zig:27:62: error: member function expected 4 argument(s), found 3
    const file_version: ?[]const u8 = if (b.build_root.handle.readFileAlloc(
                                            ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
  /home/samob/.local/zig-x86_64-linux-0.17.0-dev.387+31f157d80/lib/std/Io/Dir.zig:1323:5: note: function declared here
  pub fn readFileAlloc(
  ~~~~^~
  referenced by:
      runBuild__anon_34429: /home/samob/.local/zig-x86_64-linux-0.17.0-dev.387+31f157d80/lib/std/Build.zig:2262:44
      main: /home/samob/.local/zig-x86_64-linux-0.17.0-dev.387+31f157d80/lib/compiler/build_runner.zig:461:29
      5 reference(s) hidden; use '-freference-trace=7' to see all references
src/build/zig.zig:13:9: error: Your Zig version v0.17.0-dev.387+31f157d80 does not meet the required build version of v0.15.2
      @compileError(std.fmt.comptimePrint(
      ^~~~~~~~~~~~~
build.zig:16:24: note: called at comptime here
    buildpkg.requireZig(minimum_zig_version);
    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~

thread 'main' (272349) panicked at build.rs:74:5:
  zig build for vendored libghostty-vt failed: exit status: 2
```

## Root cause

Vendored `libghostty-vt` was written for Zig 0.15.2. Between 0.15.2 and 0.17.0:

1. `@cImport` builtin was removed (used in `pkg/wuffs/src/c.zig`)
2. `readFileAlloc` signature changed from 3 args to 4 args (used in `build.zig` build scripts)
3. `requireZig` compile-time check bails on version mismatch

## Fix

Install Zig 0.15.2: https://ziglang.org/download/0.15.2/zig-linux-x86_64-0.15.2.tar.xz

```bash
tar -xf zig-linux-x86_64-0.15.2.tar.xz -C ~/.local/
ln -sf ~/.local/zig-linux-x86_64-0.15.2/zig ~/.local/bin/zig
zig version  # should print 0.15.2
```