I'm talking about trinity in blfs-dev list. Maybe Trinity will be included in BLFS book. (http://www.linuxfromscratch.org/blfs/)

Problem is it needs a stable long-term official reference to sources. (http and/or ftp)

What are the good ones?

For example, I found these are valid links for Qt but will they work for some years? http://ppa.quickbuild.pearsoncomputing.net/trinity/releases/3.5.13/dependenc... http://mirror.its.uidaho.edu/pub/trinity/releases/3.5.13/dependencies/qt3-3.... ftp://mirror.its.uidaho.edu/trinity/releases/3.5.13/dependencies/qt3-3.3.8.d.tar.gz

Is there a "canonical" ftp site?