Solving the 'Library Not Loaded' Error: A Guide to Fixing libssl.1.0.0.dylib in OpenSSL on macOS

When working with OpenSSL on macOS, you might encounter the infamous "Library not loaded" error, specifically mentioning libssl.1.0.0.dylib. This error occurs when the required OpenSSL library version is not present on your system or is not properly linked. In this guide, we'll walk you through the steps to fix this issue and get you back up and running with OpenSSL.

Table of Contents

  1. Understanding the Error
  2. Step-by-Step Solution
  3. Check Your OpenSSL Version
  4. Install the Correct OpenSSL Version
  5. Create a Symbolic Link
  6. Verify the Fix
  7. FAQ

Understanding the Error

The "Library not loaded" error in OpenSSL is typically caused by one of the following issues:

  1. The required version of the OpenSSL library (libssl.1.0.0.dylib) is not installed on your system.
  2. The installed OpenSSL library is not properly linked to the application that requires it.

Before we dive into the solution, let's make sure you have a basic understanding of OpenSSL and its libraries. OpenSSL is an open-source toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols. It is widely used for secure communication over computer networks. The OpenSSL libraries, such as libssl and libcrypto, provide the necessary functionality for applications to use these protocols.

Step-by-Step Solution

Step 1: Check Your OpenSSL Version

First, open a Terminal window and enter the following command to check the currently installed version of OpenSSL:

openssl version

If the output shows a version other than 1.0.0, or if OpenSSL is not installed at all, proceed to the next step.

Step 2: Install the Correct OpenSSL Version

To install the correct version of OpenSSL, you can use the Homebrew package manager. If you don't have Homebrew installed, follow the instructions on their website to set it up.

Once you have Homebrew installed, run the following commands to install OpenSSL 1.0.0:

brew tap-new local/openssl
brew extract --version=1.0.0 openssl local/openssl
brew install local/openssl/[email protected]

This will install OpenSSL 1.0.0 in a separate directory, so it won't conflict with any other installed OpenSSL versions.

Now that you have OpenSSL 1.0.0 installed, you need to create a symbolic link to the libssl.1.0.0.dylib library so that applications can find it. Run the following commands in the Terminal:

sudo mkdir -p /usr/local/lib
sudo ln -s /usr/local/opt/[email protected]/lib/libssl.1.0.0.dylib /usr/local/lib/
sudo ln -s /usr/local/opt/[email protected]/lib/libcrypto.1.0.0.dylib /usr/local/lib/

Step 4: Verify the Fix

To verify that the "Library not loaded" error has been resolved, try running the application that previously encountered the issue. If everything is set up correctly, you should no longer see the error.


Q1: Can I have multiple versions of OpenSSL installed on my system?

Yes, you can have multiple versions of OpenSSL installed on your system. Homebrew allows you to install different versions in separate directories, so they don't conflict with each other. Just make sure to create the appropriate symbolic links for each library version, as shown in Step 3.

Q2: How can I update my OpenSSL version to the latest release?

To update your OpenSSL version to the latest release, you can use the Homebrew package manager. Run the following command in the Terminal:

brew upgrade openssl

Q3: How do I uninstall OpenSSL from my system?

To uninstall OpenSSL from your system, you can use the Homebrew package manager. Run the following command in the Terminal:

brew uninstall openssl

Yes, you can use a similar approach to fix other library-related errors in OpenSSL. Just make sure to install the correct library version and create the necessary symbolic links as shown in the guide.

Q5: Is there an alternative solution if I don't want to use Homebrew?

If you don't want to use Homebrew, you can manually download the required OpenSSL version from the OpenSSL website and compile it from source. However, this might be more complex and time-consuming than using Homebrew.

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