Fix the 'failed to run custom build command' error by running 'cargo build -vv' to identify the specific script failure.
The error occurs because a custom build script failed to execute, often due to missing system dependencies or a logic error in build.rs. Run the build with verbose output to see the specific failure reason:
cargo build -vv
Check the output for the exact command that failed and install any missing system packages or fix the script logic accordingly.
The "failed to run custom build command" error means a special setup script your project runs before compiling has crashed. Think of it like a chef trying to prep ingredients but finding the oven is broken; the cooking can't start until the oven is fixed. You need to see exactly what broke in that setup step to fix it.