It’s not a surprise that libspectre was thought to be used mainly (but not only) by evince and okular. I’ve just committed a patch to evince to use libspectre when it’s present, otherwise falling back to gs. I haven’t removed the old gs code because libspectre is still too new and it’s not yet shipped by distros.
There are many many advantages of using libspectre in evince, some of them:
- One of the most important advantages is probably that it’s noticeable faster.
- Postscript printing improvements: print as PDF, multiple copies (bug #443859), reverse and collate are now supported.
- Page labels
- PS specials support in dvi documents (bug #386005)
- Other bugs fixed: #317106, #499787, #501235, #421879, #445797, #486547