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Problem is not in kiltdown and in your installation of QT

i think u have two qt versions installed on your mashine

ok u can have all qt ver's if u want but point right qt lib
to ld
or if this is soo hard for you just edit makefile
and add full patch to qt threaded lib( mt) or recompile qt
with thread support....

or u can use -L/usr/lib/qt230/lib -lqt-mt
or -L/where/is/your/qt/lib -lqt-mt

in kiltdown don't exist even one line of some about
OpenGL :))

anyway will be nice to have OpenGL 3D email client

:)))