How to Fix "OSError: no library called "cairo" was found" in GTK++ Windows Installation Package

If you receive the error message "OSError: no library called 'cairo' was found" when trying to install GTK++ on Windows, it may indicate that the "libcairo-2" library is missing. You may also see error messages about being unable to load the "libcairo.so.2" or "libcairo-2.dll" libraries. To fix this error, you will need to install the libcairo-2 library and make sure it is in the appropriate search path. Here's how to do it:

- Download the libcairo-2 library from a trusted source.

- Extract the library files to a folder on your computer.

- Open the System Properties dialog by right-clicking on "My Computer" and selecting "Properties."

- Click the "Advanced system settings" link.

- Click the "Environment Variables" button.

- Under "System Variables," scroll down and find the "Path" variable. Click the "Edit" button.

- Add the path to the folder where you extracted the library files to the "Variable value" field.

- Click "OK" to close all windows.

After following these steps, try installing GTK++ again. The "OSError: no library called 'cairo' was found" error should be resolved.