130 lines
3.4 KiB
Markdown
130 lines
3.4 KiB
Markdown
---
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name: dev-setup
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type: reference
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tags: [setup, dependencies, build, linux, fedora]
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description: Authoritative build dependencies and launch instructions for Kon on Fedora Linux
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---
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# Kon — Developer Setup
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Last updated: 2026/04/18. Primary dev target: Fedora 43, x86_64, KDE Wayland, NVIDIA RTX 4070.
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---
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## System dependencies
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### Required (CPU build)
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```bash
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sudo dnf install cmake clang-devel
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```
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| Package | Why |
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|---|---|
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| `cmake` | whisper-rs-sys build system |
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| `clang-devel` | bindgen header generation for whisper-rs-sys |
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**Fedora-specific:** `libclang.so` lives in `/usr/lib64/llvm21/lib64/`, not on the standard search path. Set permanently:
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```bash
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set -Ux LIBCLANG_PATH /usr/lib64/llvm21/lib64
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```
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Or prefix every build command:
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```bash
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LIBCLANG_PATH=/usr/lib64/llvm21/lib64 npm run tauri dev
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```
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### Required (Vulkan GPU build)
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```bash
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sudo dnf install vulkan-headers vulkan-loader-devel glslc
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```
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| Package | Why |
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|---|---|
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| `vulkan-headers` | `vulkan.h` needed by ggml-vulkan CMake |
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| `vulkan-loader-devel` | `libvulkan.so` link target for CMake |
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| `glslc` | Compiles GLSL compute shaders to SPIR-V at build time |
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The NVIDIA Vulkan ICD (`nvidia_icd.json`) is included in the standard NVIDIA driver package — no extra install needed if the driver is already installed.
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---
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## Node / Rust
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```bash
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npm install # frontend deps — run once after clone
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```
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Rust toolchain managed by `rustup`. No extra steps needed beyond what Tauri requires.
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---
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## Launch commands
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### CPU build (default)
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```bash
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cd /home/jake/Documents/CORBEL-Projects/kon
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LIBCLANG_PATH=/usr/lib64/llvm21/lib64 npm run tauri dev
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```
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Once `set -Ux LIBCLANG_PATH` is in fish config, this becomes:
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```bash
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npm run tauri dev
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```
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### Vulkan GPU build
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Same command — the `whisper-vulkan` feature flag is already set in `crates/transcription/Cargo.toml`. First build compiles Vulkan compute shaders and takes longer than usual.
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Confirm GPU is active in startup logs:
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```
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whisper_backend_init_gpu: device 0: NVIDIA GeForce RTX 4070 ← GPU active
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```
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vs CPU fallback:
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```
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whisper_backend_init_gpu: device 0: CPU (type: 0) ← no GPU
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```
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---
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## Startup log reference
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Normal startup sequence:
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```
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[startup] Wayland workaround: GDK_BACKEND=x11
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[startup] DB init: ~4ms
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[startup] Preferences load: ~200µs
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[startup] Whisper model pre-warmed successfully
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```
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The Wayland workarounds are injected automatically by `ensure_x11_on_wayland()` in `src-tauri/src/lib.rs` — no manual env-var prefix needed.
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---
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## Known build gotchas
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| Issue | Cause | Fix |
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| `Unable to find libclang` | Fedora puts clang libs in versioned path | `set -Ux LIBCLANG_PATH /usr/lib64/llvm21/lib64` |
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| `Could NOT find Vulkan (missing: glslc)` | Shader compiler not installed | `sudo dnf install vulkan-headers vulkan-loader-devel glslc` |
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| `there is no reactor running` | `tokio::spawn` called before runtime starts in `setup()` | Use `tauri::async_runtime::spawn` instead |
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| `effect_update_depth_exceeded` | Svelte 5 `$state` object reassigned instead of mutated | Use `Object.assign(state, updates)` — never spread-replace module-level state |
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---
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## GPU notes
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- **Vulkan** is the GPU backend used here. CUDA is not required.
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- `crates/transcription/Cargo.toml` feature: `whisper-vulkan` → `whisper-rs/vulkan` → `ggml-vulkan`
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- CPU and GPU builds are otherwise identical — same binary, same model files.
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- Expected speedup on RTX 4070: ~10–15× over CPU for `whisper-base.en`.
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