In fact I made the libXinerama change in a dep file locally (in hindsight a mistake) and uploaded it, but on another machine locally I see the dep is liblcms2.
ldd doesn't work with libreoffice, but it the extension works for me and:
ls -d /tmp/tcloop/*cms*
/tmp/tcloop/liblcms2/
..so I presume that this is the correct dep, but maybe you could check and confirm before I mess it up again