As one of the top 5 Fedora packagers (top 5? I used to be top 2, must be slipping), I've finally finished rebuilding as many of my packages for EL-4 and EL-5 as possible. Here's what I couldn't build:

Quantlib (EL-4, boost too old) SimGear (missing deps for EL-4, EL-5) blacs (EL-4, deps are not new enough) gambas (EL-4, EL-5, needs sqlite2-devel) lincity-ng (EL-4, EL-5, needs SDL_mixer, SDL_gfx) ntfsprogs (fails on EL-4, gnutls is too old) perl-Apache-Session-Wrapper (EL-4, EL-5, needs Params::Validate) perl-CGI-Untaint-date (EL-4, EL-5, needs Date::Simple) perl-CGI-Untaint-email (EL-4, EL-5, needs Email::Valid) perl-Class-DBI (EL-4, EL-5, needs LOTS of missing perl bits) perl-Class-DBI-AbstractSearch perl-Class-DBI-AsForm perl-Class-DBI-FromCGI perl-Class-DBI-Loader perl-Class-DBI-Loader-Relationship perl-Class-DBI-Pager perl-Class-DBI-Pg perl-Class-DBI-Plugin perl-Class-DBI-Plugin-RetrieveAll perl-Class-DBI-Plugin-Type perl-Class-DBI-SQLite perl-Class-DBI-mysql ^^^ (not built for EL-4, EL-5, needs Class::DBI) perl-DBD-AnyData (EL-4, EL-5, needs SQL::Statement) perl-DBD-SQLite2 (EL-4, EL-5, needs sqlite2) perl-DBIx-ContextualFetch (EL-4, EL-5, needs Test::Pod) perl-Data-Page (EL-4, EL-5, needs Test::Pod, Test::Exception) perl-Email-Abstract (EL-4, EL-5, needs Test::Pod) perl-Email-Date (EL-4, EL-5, needs Email::Abstract, Time::Piece) perl-Email-MIME-Attachment-Stripper (EL-4, EL-5, Email::MIME, Email::MIME::ContentType, Email::MIME::Modifier) perl-Email-MIME-Creator (EL-4, EL-5, Test::Pod, Email::MIME, Email::Date, Email::MIME::Modifier, Email::Simple, Email::Simple::Creator) perl-Email-Reply (EL-4, EL-5, Test::Pod, Email::Abstract, Email::Address, Email::MIME, Email::MIME::Creator, Email::MIME::Modifier, Email::Simple, Email::Simple::Creator, Email::Date) perl-Email-Send (EL-4, EL-5, Email::Address, Email::Simple, Return::Value, Email::Abstract, Test::Pod) perl-Email-Simple-Creator (EL-4, EL-5, Email::Date, Email::Simple, Test::Pod) perl-Email-Valid (Test::Pod::Coverage on EL-4, Test::Pod on EL-5) perl-ExtUtils-XSBuilder (EL-4, EL-5, Tie::IxHash) perl-HTML-Tree (EL-4, EL-5, Test::Pod) perl-HTTP-Body (EL-4, EL-5, Test::Pod) perl-IO-CaptureOutput (EL-4, EL-5, Test::Pod::Coverage) perl-Mail-Box (EL-4, EL-5, Email::Abstract, Mail::Transport::Dbx, HTML::Tree, HTML::Format, File::Remove, MIME::Types) perl-Mail-Box-Parser-C (EL-4, EL-5, Mail::Box) perl-Mail-Transport-Dbx (EL-4, EL-5, Test::Pod) perl-Maypole (EL-4, EL-5, LOTS OF STUFF) perl-MIME-Types (EL-4, EL-5, Test::Pod) perl-Return-Value (EL-4, EL-5, Test::Pod::Coverage, Test::Perl::Critic) perl-SQL-Abstract-Limit (EL-4, EL-5, Class::DBI, DBD::AnyData) perl-Template-GD (EL-4, EL-5, GD::Graph3d) perl-Template-Plugin-Class (EL-4, EL-5, Template::Plugin, Module::Build) perl-Template-Toolkit (EL-4, EL-5, GD::Graph3d, Image::Info, Image::Size) perl-Test-MockModule (EL-4, EL-5, Test::Pod) perl-XML-RSS (EL-4, EL-5, Test::Pod, Test::Manifest, Test::Differences) pydot (EL-4, EL-5, needs pyparsing) rekall (EL-4, EL-5, needs scons) rocksndiamonds (EL-4, EL-5, needs SDL_mixer, at a minimum) winpdb (EL-4, EL-5, no wxPython) wlassistant (EL-4, EL-5, needs scons) xpdf (EL-5 needs t1lib-devel)

So, in case you were curious, thats why those packages aren't in EPEL. :)

~spot