i just put a bugfix release of Gem-0.91 online.
download it from - http://gem.iem.at - https://sourceforge.net/project/platformdownload.php?group_id=64325
or svn checkout from - https://pd-gem.svn.sourceforge.net/svnroot/pd-gem/tags/0.91-2/
Changelog:
- made [pix_freeframe] not crash on OSX (fixes #2476663)
- do not use libTIFF/libJPEG is ImageMagick++ is present (fixes #2449674 & #2506838)
- always use RGBA for image-loading on OS-X (fixes #2484087)
- check for gl/glu headers (fixes #2032488)
- force focus when drawing without borders on X (fixes #2192358)
- only use multitexturing if hardware supports it (fixes potential crashes)
have fun