If you take a look at the home page [1], he says he's having problems with the cairo pdf library not supporting things he wants, so that may be the source of th

If you take a look at the home page [1], he says he's having problems with the cairo pdf library not supporting things he wants, so that may be the source of this (he does mention letter spacing specifically). 1. http://www.sile-typesetter.org/index.html http://www.sile-typesetter.org/index.html