I have had to do this before, and what I find the easiest for me to do is something like this:
function check_for_library() {
return class_exists( 'Class_Of_Library_In_Question' );
}
Then you just fill in the right details and make a call to this function.
if( ! check_for_library() ) {
include_once( 'library_file.php' );
}
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