.debs are a cinch:..ok, I can do decent rpms the "rpmbuild -ta" way, never tried to build X or DRI rpm's though, debs is as easy? (Have Mach64 ugh cards.)
apt-get source <package> cd <package> dpkg-buildpackage
Of course, for something like XFree86 4.3, you would specifically need the source package from experimental.
Now if you're talking about building OpenOffice...
..<plugs-ears-n-ducks/> ;-)
-Roberto
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