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How To Fix “CMake Error: your CXX compiler: ‘CMAKE_CXX_COMPILER-NOTFOUND’ was not found” Error

Ubuntu 11

In the world of programming, encountering errors is a common occurrence. One such error that you may come across while using CMake is “CMake Error: your CXX compiler: ‘CMAKE_CXX_COMPILER-NOTFOUND’ was not found”. This error generally indicates that the C++ compiler is either missing or not properly configured. In this article, we will delve into the reasons behind this error and provide detailed solutions to rectify it.

Understanding the Error

Before we jump into the solutions, let’s first understand what this error message means. CMake is a cross-platform free and open-source software tool for managing the build process of software using a compiler-independent method. It is designed to build, test, and package software.

The error “CMAKE_CXX_COMPILER-NOTFOUND” indicates that CMake is unable to find the C++ compiler (CXX stands for C++). This can occur due to several reasons such as the compiler not being installed, the compiler path not being set correctly, or the necessary packages not being installed.

Solution 1: Installing the build-essential package in Ubuntu

If you are using Ubuntu, the first solution to try is to install the build-essential package. This package includes the necessary compilers and libraries. To install it, open the terminal and run the following command:

sudo apt-get update && sudo apt-get install build-essential

The sudo command is used to run the following command with root privileges. apt-get update updates the package lists for upgrades and new package installations. apt-get install build-essential installs the build-essential package.

Solution 2: Installing the gcc-c++ package in Fedora

For Fedora users, the gcc-c++ package can be installed to resolve this error. Open the terminal and run the following command:

sudo dnf install gcc-c++

Here, dnf is the next-generation version of yum, a package manager for RPM-based Linux distributions. install gcc-c++ installs the gcc-c++ package, which includes the g++ compiler.

Solution 3: Checking and Installing the g++ Compiler

Regardless of the Linux distribution you are using, you can check if the g++ compiler is installed by running the following command in the terminal:

which g++

The which command in Linux is used to identify the location of executables. If the which g++ command doesn’t return anything, it means the g++ compiler is not installed. In this case, you need to install the GCC package, which includes the g++ compiler.

Additional Tips

  • Ensure to set the CMAKE_CXX_COMPILER variable to the correct compiler path or name. This can be done in the CMakeLists.txt file.
  • If you encounter issues with autotools, such as the “libtoolize” error, it may indicate that the necessary autotools packages are missing. Install the required autotools package to resolve this issue.

Conclusion

Fixing the “CMAKE_CXX_COMPILER-NOTFOUND” error involves checking your compiler installation and ensuring the right packages are installed. It’s also important to set the correct compiler path. If you still encounter issues after following these steps, consider seeking help from the appropriate forums or communities for your specific Linux distribution. Remember, encountering errors is a part of the learning process in programming. Happy coding!

What is CMake?

CMake is a cross-platform free and open-source software tool for managing the build process of software using a compiler-independent method. It is designed to build, test, and package software.

What does the error “CMAKE_CXX_COMPILER-NOTFOUND” mean?

The error "CMAKE_CXX_COMPILER-NOTFOUND" indicates that CMake is unable to find the C++ compiler (CXX stands for C++). This can occur due to several reasons such as the compiler not being installed, the compiler path not being set correctly, or the necessary packages not being installed.

How can I fix the “CMAKE_CXX_COMPILER-NOTFOUND” error in Ubuntu?

To fix the error in Ubuntu, you can try installing the build-essential package by running the command "sudo apt-get update && sudo apt-get install build-essential" in the terminal.

How can I fix the “CMAKE_CXX_COMPILER-NOTFOUND” error in Fedora?

To fix the error in Fedora, you can try installing the gcc-c++ package by running the command "sudo dnf install gcc-c++" in the terminal.

How can I check if the g++ compiler is installed?

You can check if the g++ compiler is installed by running the command "which g++" in the terminal. If the command doesn’t return anything, it means the g++ compiler is not installed.

How can I set the CMAKE_CXX_COMPILER variable?

The CMAKE_CXX_COMPILER variable can be set in the CMakeLists.txt file. Make sure to set it to the correct compiler path or name.

What should I do if I encounter issues with autotools?

If you encounter issues with autotools, such as the "libtoolize" error, it may indicate that the necessary autotools packages are missing. Install the required autotools package to resolve this issue.

Where can I seek help if I still have issues after following the steps?

If you still have issues after following the steps, consider seeking help from the appropriate forums or communities for your specific Linux distribution. They can provide further assistance and guidance.

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