Can't build OpenCV Crate : failed to run custom build command for clang-sys v1.7.0

[Gtucker3d]

Before reporting an issue please first check the
troubleshooting guide. If
the issue you're encountering is not solved thereby please state the following in your bugreport:

1. windows 64
2. cargo add opencv, cargo build
3. OpenCV version 0.89.0
4. rustc version (rustc --version) rustc 1.78.0-nightly
5. Attach the full output of the following command from your project directory:

   RUST_BACKTRACE=full cargo build -vv 

cargo build
Compiling clang-sys v1.7.0
Compiling num-traits v0.2.18
error: failed to run custom build command for clang-sys v1.7.0

Caused by:
process didn't exit successfully: C:\Users\alexs\Desktop\rust_projects\openve_tests\target\debug\build\clang-sys-8dad49d408f57131\build-script-build (exit code: 101)
--- stderr
thread 'main' panicked at C:\Users\alexs.cargo\registry\src\index.crates.io-6f17d22bba15001f\clang-sys-1.7.0\build\dynamic.rs:206:45:
called Result::unwrap() on an Err value: "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: [])"
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

RUST_BACKTRACE=full cargo build

RUST_BACKTRACE=full : The term 'RUST_BACKTRACE=full' is not recognized as the name of a
cmdlet, function, script file, or operable program. Check the spelling of the name, or if a
path was included, verify that the path is correct and try again.
At line:1 char:1

• RUST_BACKTRACE=full cargo build -vv

•   + CategoryInfo          : ObjectNotFound: (RUST_BACKTRACE=full:String) [], CommandNotFo 
   undException
    + FullyQualifiedErrorId : CommandNotFoundException
  
  

[twistedfall]

This error originates from clang-sys crate, it's can't find your clang installation. Can you please refer to the crate's readme on the ways to fix this? https://crates.io/crates/clang-sys

[Ktmr-Ktsh]

I'm the same question. I wonder what's going on?
Compiling clang-sys v1.8.1
Compiling regex v1.10.4
Compiling jobserver v0.1.31
Compiling maplit v1.0.2
The following warnings were emitted during compilation:

warning: clang-sys@1.8.1: could not execute llvm-config one or more times, if the LLVM_CONFIG_PATH environment variable is set to a full path to valid llvm-config executable it will be used to try to find an instance of libclang on your system: "couldn't execute llvm-config --prefix (path=llvm-config) (error: program not found)"

error: failed to run custom build command for clang-sys v1.8.1

Caused by:
process didn't exit successfully: C:\Users\Administrator\OneDrive\桌面\Rust\openrust\target\debug\build\clang-sys-5f7e6fd30ae4a8a1\build-script-build (exit code: 101)
--- stdout
cargo:warning=could not execute llvm-config one or more times, if the LLVM_CONFIG_PATH environment variable is set to a full path to valid llvm-config executable it will be used to try to find an instance of libclang on your system: "couldn't execute llvm-config --prefix (path=llvm-config) (error: program not found)"

--- stderr
thread 'main' panicked at C:\Users\Administrator.cargo\registry\src\index.crates.io-6f17d22bba15001f\clang-sys-1.8.1\build\dynamic.rs:225:45:
called Result::unwrap() on an Err value: "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: [])"
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

[twistedfall]

Please check item 8 in https://github.com/twistedfall/opencv-rust/blob/master/TROUBLESHOOTING.md