I run Pharo 5.0 with no problems on a Macbook Pro, but itâs running OS X v. 10.12.1. Any reason your OS is backdated? Andrew Glynn From: Pharo-users <pharo-users-bounces@lists.pharo.org> on behalf of Trussardi Dario Romano <dario.trussardi@tiscali.it> Reply-To: Any question about pharo is welcome <pharo-users@lists.pharo.org> Date: Monday, December 5, 2016 at 11:34 AM To: Any question about pharo is welcome <pharo-users@lists.pharo.org> Subject: Re: [Pharo-users] GitFileTree on Pharo 5.0 Ciao, Pharo is unable to access a library it needs; this is the native boost plugin which is normally bundled with it (and the cairo lib?)... Guys, anybody with a mac around there? Thierry            thanks Dimitris. Nativeboost has been removed and been replaced by UFFI, all libraries that used Nativeboost are now using UFFI including the Cairo backend library for Athens.            OK,                but what i need to do for load UFFI Cairo library            and for load the UFFI library required by    GitFileTree Pharo support?            I wrong to install Pharo 5.0 on my MacBookPro with OS X 10.7.5. ?            If right remember i install Pharo 5.0 from       http://pharo.org/download link            Thanks.                                   Dario