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:
Check libpq Installation: First, make sure that the
libpqlibrary is installed on your system.
libpqis the C library for PostgreSQL, and you'll need it when working with the
postgrescrate in Rust. Install the
libpqlibrary using your system's package manager.
For example, on Debian/Ubuntu:bash
sudo apt-get install libpq-dev
sudo yum install postgresql-devel
On macOS with Homebrew:bash
brew install postgresql
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_PATHenvironment variable to tell the linker where to look for shared libraries.
For example, on Linux:bash
export LIBRARY_PATH=/usr/lib/x86_64-linux-gnu # Adjust the path based on your system
export LIBRARY_PATH=/usr/local/lib # Adjust the path based on your system
Update Rust Dependencies: If you are using the
postgrescrate in your project, make sure that you have the latest version of the crate and its dependencies. Update your
Cargo.tomlfile to use the latest versions and run
[dependencies] postgres = "latest-version" # Add other dependencies as needed
Rebuild the Project: After making sure that the
libpqlibrary is installed and accessible, rebuild your Rust project:bash
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.