Hello.
I would like to advice you that, under Slitaz 5.0, you can benefit by downloading the 2.1 to 2.3 revisions of FoxiReader, because those versions are very interesting for us :
1- light and fast
2- works under Slitaz
3- can edit, highlight, comments, and so on PDF files, like Okular, but without KDE ;-)
Qpdf, of course, remains a good light alternative to highlight and comment PDF files, but under Qpdf, you can't, alas, select text letter by letter, only by rectangular block !
Contra Foxit : the install isn't clean, under local /opt directory, and you must do some tricks in order to get Foxit 2.x in you start menu.
Note : Foxit 2.4 seems to be buggy under Slitaz, I don't know why ...