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---
title: FAQ
weight: 20
---
## vcpkg download package failed
### error
```
-- Fetching https://chromium.googlesource.com/libyuv/libyuv 287158925b0e03ea4499a18b4e08478c5781541b...
CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:127 (message):
Command failed: D:/program/Git/mingw64/bin/git.exe fetch https://chromium.googlesource.com/libyuv/libyuv 287158925b0e03ea4499a18b4e08478c5781541b --depth 1 -n
```
### solution
Use a browser to download `https://chromium.googlesource.com/libyuv/libyuv/+archive/287158925b0e03ea4499a18b4e08478c5781541b.tar.gz`, then move it into `vcpkg/downloads` and reinstall.
## package in Cargo.lock not exist
### error
```
$ cargo run
Updating git repository `https://github.com/open-trade/confy`
warning: spurious network error (2 tries remaining): failed to receive response: Operation Timeout
; class=Os (2)
error: failed to get `confy` as a dependency of package `hbb_common v0.1.0 (D:\rustdesk\rustdesk\rustdesk\libs\hbb_common)`
Caused by:
failed to load source for dependency `confy`
Caused by:
Unable to update https://github.com/open-trade/confy#27fa1294
Caused by:
object not found - no match for id (27fa12941291b44ccd856aef4a5452c1eb646047); class=Odb (9); code=NotFound (-3)
```
Maybe the author used `git force push` and the previous commit was overwritten.
### solution
`cargo update`, force the package to be updated
## VCPKG_ROOT not set
### error
```
thread 'main' panicked at 'Failed to find package: VcpkgNotFound("No vcpkg installation found. Set the VCPKG_ROOT environment variable or run 'vcpkg integrate install'")', libs\scrap\build.rs:7:45
```
### solution
Add `VCPKG_ROOT` environment variable, or run with `VCPKG_ROOT=vcpkg_dir cargo run`
## clang not installed, or LIBCLANG_PATH not set
### error
```
thread 'main' panicked at 'Unable to find libclang: "couldn't find any valid shared libraries matching: ['clang.dll', 'libclang.dll'], set the `LIBCLANG_PATH` environment variable to a path where one of these files can be found (invalid: [])"', C:\Users\selfd\.cargo\registry\src\mirrors.ustc.edu.cn-61ef6e0cd06fb9b8\bindgen-0.59.2\src/lib.rs:2144:31
```
### solution
Install [llvm](https://releases.llvm.org/download.html), Add the `LIBCLANG_PATH` environment variable as `llvm_install_dir/bin`