The error message rust-lld: error: unable to find library -llibpq suggests that the Rust linker (rust-lld) is unable to find the libpq library when building your Rust project. This usually happens when the linker is not able to locate the required library on the system.

To resolve this issue, you need to ensure that the libpq library is properly installed and accessible to the Rust linker. Here are the steps you can follow:

  1. Check libpq Installation: First, make sure that the libpq library is installed on your system. libpq is the C library for PostgreSQL, and you'll need it when working with the postgres crate in Rust. Install the libpq library using your system's package manager.

    For example, on Debian/Ubuntu:

    sudo apt-get install libpq-dev

    On CentOS/RHEL:

    sudo yum install postgresql-devel

    On macOS with Homebrew:

    brew install postgresql
  2. Set Library Path: If the library is installed, but the linker still can't find it, you may need to set the library path explicitly. You can use the LIBRARY_PATH environment variable to tell the linker where to look for shared libraries.

    For example, on Linux:

    export LIBRARY_PATH=/usr/lib/x86_64-linux-gnu # Adjust the path based on your system

    On macOS:

    export LIBRARY_PATH=/usr/local/lib # Adjust the path based on your system
  3. Update Rust Dependencies: If you are using the postgres crate in your project, make sure that you have the latest version of the crate and its dependencies. Update your Cargo.toml file to use the latest versions and run cargo update.

    [dependencies] postgres = "latest-version" # Add other dependencies as needed
  4. Rebuild the Project: After making sure that the libpq library is installed and accessible, rebuild your Rust project:

    cargo clean cargo build

If the above steps don't resolve the issue, there might be other configuration issues with your Rust project or system setup. In that case, please provide more details about your project's Cargo.toml, the platform you're working on, and any additional error messages to help further diagnose the problem.

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