Coding⏱️ 3 min read📅 2026-06-03

How to Fix: libpthread.so.0: error adding symbols: DSO missing from command line

OpenVSwitch compilation error: libpthread.so.0: error adding symbols: DSO missing from command line.

Quick Answer: The issue is likely due to the missing -lpthread flag in the compiler command. Add -lpthread to the flags to fix the error.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

When compiling OpenVSwitch version 1.5.0, you may encounter an error with 'libpthread.so.0: error adding symbols: DSO missing from command line'. This issue affects users who are using a Linux-based system and have not properly installed the pthread library.

This error can be frustrating because it prevents the compilation process from completing successfully. However, there is a straightforward solution to resolve this problem.

⚠️ Common Causes

  • The primary reason for this error is that the pthread library is missing or not correctly linked during the compilation process. This can happen if the system does not have the pthread library installed or if it is not properly configured.
  • Another possible cause is that the OpenVSwitch package is not configured to link against the pthread library by default.

🚀 How to Resolve This Issue

Adding the pthread library manually

  1. Step 1: Step 1: Check if the pthread library is installed on your system. If it's not, you can install it using your package manager. For example, in Ubuntu-based systems, you can run the command 'sudo apt-get install libpthread-dev'.
  2. Step 2: Step 2: Update the OpenVSwitch configuration file to link against the pthread library. You can do this by adding the following line to the 'Makefile' file in the OpenVSwitch source directory: '-lpthread'
  3. Step 3: Step 3: Re-run the compilation command with the updated Makefile.
  4. Step 4: Step 4: Verify that the error has been resolved by re-running the compilation command.

Configuring OpenVSwitch to link against pthread library by default

  1. Step 1: Step 1: Locate the 'Makefile' file in the OpenVSwitch source directory. This file contains the configuration settings for the compilation process.
  2. Step 2: Step 2: Add the '-lpthread' flag to the 'LDFLAGS' variable in the Makefile. For example, you can add the following line to the 'Makefile': 'LDFLAGS = -lpthread'
  3. Step 3: Step 3: Re-run the compilation command with the updated Makefile.
  4. Step 4: Step 4: Verify that the error has been resolved by re-running the compilation command.

🎯 Final Words

By following these steps, you should be able to resolve the 'libpthread.so.0: error adding symbols: DSO missing fromcommand line' error when compiling OpenVSwitch version 1.5.0. Remember to update your system and configuration settings accordingly to avoid this issue in the future.

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