Скачать или смотреть Solving the libpq-fe.h: No such file or directory Error on Ubuntu 20

Discover how to resolve the `libpq-fe.h` not found error when using g++ on Ubuntu 20 by setting the correct compilation paths.
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Resolving the libpq-fe.h: No such file or directory Error on Ubuntu 20

If you’re working with PostgreSQL development on Ubuntu and you've encountered the error message stating that libpq-fe.h cannot be found, you’re not alone. This common issue arises when compiling C++ code that relies on the PostgreSQL library. Thankfully, there's a straightforward solution to get things working again. Let’s dive into the details.

Understanding the Problem

The libpq-fe.h header file is crucial for C and C++ applications that need to interact with PostgreSQL databases. When you compile your code and receive an error indicating that this file is missing, it generally means that the compiler can’t locate the necessary header files from the PostgreSQL development package.

Even if you have installed the libpq-dev package, which includes these headers, misconfiguration can lead to compilation issues. In this case, you already have installed the package correctly using:

[[See Video to Reveal this Text or Code Snippet]]

However, the compiler still cannot find libpq-fe.h, which means we need to provide it with the correct path.

The Solution

Step 1: Set the Include Path

When compiling with g++, you need to specify the path to the PostgreSQL headers. In your Makefile, add the include path using the -I flag. Here’s how you can accomplish that:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Set the Library Path

Beyond just including the headers, you also need to ensure the linker can locate the PostgreSQL binaries. Add the library path using the -L flag in your Makefile:

[[See Video to Reveal this Text or Code Snippet]]

Complete Makefile Example

Here’s a complete example of what your Makefile might look like after these additions:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Resolving cannot find -lpq Error

In some cases, you might encounter another error indicating cannot find -lpq. This usually happens if the symbolic link for the PostgreSQL library is not correctly set up. You can resolve this by creating a symbolic link as follows:

[[See Video to Reveal this Text or Code Snippet]]

This command ensures that the dynamic linker can locate the library files correctly during compilation.

Conclusion

By ensuring that you specify the correct include and library paths in your Makefile, you can successfully compile your C++ code with PostgreSQL support on Ubuntu 20. Don’t forget these crucial steps: include the PostgreSQL headers and set the library paths properly. Now, you can develop your PostgreSQL applications without any interruptions.

Feel free to share any additional tips or issues you might encounter in the comments below!