Mojave because -fopen-file-writable: LibreOffice should be able to read the .ODT and .pdf files and open them... This is because in OS X 10.14 Mojave the option “Open with...” is disabled by default. To correct this issue, click the “Edit” menu button and then click System Preferences → General, then click Open With, and finally choose “Open with the Apple ...” entry, as shown in this image. The solution is actually fairly simple. First, create a file named preferences.list with any text editor. You can open it with a text editor, but I recommend a text editor like TextWrangler to make things a bit easier. To start LibreOffice, make sure the preferences.list is not open, or else you will get an error message: Cannot set an access control entry for preference.list. Reason: preference may be an older version and cannot be enabled After that, go to System Preferences and enable the option “Open with...”. This is also a file that should be created if you upgraded from OS X Mavericks and 8.10 El Capitan, or if you didn't get around to upgrading to Yosemite and did so in the past couple of Mac OS X versions. If you don't want to enable this system preference, you only have to install the file manually in the Applications folder: If you don't have this file by default, you can create it from the Desktop with the desktop tool CreateDesktopFile or copy the Open With ... entry from your preferences.list into the desktop file. Finally, just click the “Run” button to run LibreOffice. If everything went well LibreOffice should run just fine on your MacBook. Please note that the “Mac OS X 10.11 (Mavericks) LibreOffice and macOS Sierra 10.12 Sierra I want to have macOS Sierra 10.12 Sierra installed and working with LibreOffice, but I'm concerned that it won't get a lot faster since it contains Mac OS X 10.12-related bugs. Will macOS 10.12-related problems affect LibreOffice (including opening .ODT files) or just the apps themselves? If your macOS Sierra is running at least Sierra 10.