Could not find swig (missing: swig_executable swig_dir)

Answer:

In order to fix the error “could not find swig (missing: swig_executable swig_dir)”, you need to install or configure Swig properly on your system. Here’s how you can do it:

1. Install Swig:

To install Swig, you can follow these steps:

1. Open your terminal or command prompt.
2. Run the appropriate command based on your operating system:
   sudo apt-get install swig (for Ubuntu or Debian-based systems)
   brew install swig (for macOS with Homebrew)
   choco install swig (for Windows with Chocolatey)
   Make sure you have the necessary permissions to install software on your system.

2. Verify Swig Installation:

After the installation is complete, you can verify it by running the following command:

swig -version

If the command shows the version of Swig installed, then it means Swig is correctly installed on your system.

3. Configure Swig Executable and Directory:

If Swig is already installed but the error still persists, you need to configure the Swig executable and directory path manually. Here’s how:

1. Find the Swig executable on your system. It is usually located in the system’s PATH.
2. Once you find the executable, you need to add the directory path to the system’s environment variables. This will allow other programs to locate Swig.
3. Open your terminal or command prompt and run the following command to add the Swig directory path:
   export PATH=/path/to/swig:$PATH
   Replace /path/to/swig with the actual directory path where Swig is installed.

Now, try running the command that previously resulted in the error. It should work without throwing the “could not find swig” error anymore.

Example:

Let’s say you are using a project that requires Swig to be installed. You followed the steps above and successfully installed Swig on your Ubuntu system. Now, when you run the command swig -version, it shows the version as 4.0.2. This means Swig is installed correctly on your system.

However, when you try to build the project, it still gives you the “could not find swig” error. In this case, you manually configure the Swig executable and directory by adding the following line to your .bashrc or .bash_profile file:

export PATH=/path/to/swig:$PATH

Make sure to replace /path/to/swig with the actual path of the Swig executable on your system.

After saving the file, restart your terminal or run source ~/.bashrc or source ~/.bash_profile to apply the changes. Now, when you build the project, it should find Swig without any issues.