how to correctly compile threads support?

[jacek]

The program that I'm trying to install which required qt says it must have thread support, in other words the library libqt-mt.

Most likely that program requires Qt3 and it won't run with Qt4.

ld: skipping incompatible /usr/lib/libqt-mt.so when searching for -lqt-mt
ld: cannot find -lqt-mt

For some reason it doesn't like that library. Do you have a 64-bit processor?

Now, if I may quote from TrollTech's installation guide for enabling multithreading in qt3
...
However, when I execute the command
...
but this still does not result in the creation of a libqt-mt.a.

Qt4 libraries are always multithreaded, but Qt4 is not backward-compatible with Qt3, so you can't use it instead of Qt3. Instructions from Qt3 docs won't work with Qt4 either.