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With reference to Trinity. :) For example, building kprinter is useless unless cups is installed. Many distro maintainers no longer build poppler with Qt3 support. Amarok breaks unless ruby is installed while building. Etc. No need to get carried away with this list. :)
Poppler should not need to be rebuilt--see this code in the GIT tree: http://git.trinitydesktop.org/cgit/tdegraphics/tree/kfile-plugins/dependenci...
If something else depends on Poppler being rebuilt then there is a problem that needs to be fixed. Upstream will not support Qt3 and we cannot ask users to install modified versions of base system packages.
Tim