undefined reference to `Exiv2

This error message typically occurs when the linker is unable to find the definition of a function or symbol that is referenced in the code. In this case, it seems that the linker is unable to find the definition of the function or symbol `Exiv2`.

To resolve this issue, you may need to check whether you have properly installed the Exiv2 library and whether you have linked it correctly in your code. You may also need to check whether you have included the appropriate header files for the Exiv2 library.

Here are some steps that you can follow to resolve this issue:

1. Check whether you have installed the Exiv2 library properly. You can do this by running the following command in the terminal:

   pkg-config --libs --cflags exiv2

This command should output the library path and the header file path for the Exiv2 library. If the command does not output anything, it means that the Exiv2 library is not installed or not properly configured.

2. If the Exiv2 library is installed, make sure that you have linked it properly in your code. You can do this by adding the following line to your Makefile or build script:

   -lexiv2

This will link your code with the Exiv2 library.

3. Make sure that you have included the appropriate header files for the Exiv2 library in your code. You can do this by adding the following line to your code:

   #include <exiv2/exiv2.hpp>

This will include the necessary header files for the Exiv2 library.

Once you have made these changes, try recompiling your code and see if the error message goes away. If the error message persists, you may need to consult the documentation for the Exiv2 library or seek help from the community to resolve the issue.