How to download and setup pdfium-lib
Open terminal and run command
                                            git clone https://github.com/paulocoutinhox/pdfium-lib.git
                                        
                                        git clone is used to create a copy or clone of pdfium-lib repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with pdfium-lib https://github.com/paulocoutinhox/pdfium-lib/archive/master.zip
Or simply clone pdfium-lib with SSH
                                            [email protected]:paulocoutinhox/pdfium-lib.git                                    
                                    If you have some problems with pdfium-lib
You may open issue on pdfium-lib support forum (system) here: https://github.com/paulocoutinhox/pdfium-lib/issuesSimilar to pdfium-lib repositories
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