Using this command:

g++ -B /usr/lib/qt3 blaat.cpp

I get:

/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0xc): undefined reference to `QGList::clear()'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x10): undefined reference to `QGList::~QGList()'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x14): undefined reference to `QGList::~QGList()'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x18): undefined reference to `QPtrCollection::newItem(void*)'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x20): undefined reference to `QGList::compareItems(void*, void*)'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x24): undefined reference to `QGList::read(QDataStream&, void*&)'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTV6QGList+0x28): undefined reference to `QGList::write(QDataStream&, void*) const'
/home/pathfinder/tmp/cc1c18ms.o(.gnu.linkonce.r._ZTI6QGList+0x8): undefined reference to `typeinfo for QPtrCollection'
collect2: ld returned 1 exit status


I don't really get in.. Can anyone help me?

You're not linking in the necessary libraries. They look like Qt libraries to me, but I may be wrong.

If they are, what do I do?

Read up about how to compile programs for whatever system you're using. The people who write that stuff don't expect you to just know so it must be documented somewhere. pkg-config can help you if you know what libraries you're using. I mean, if you're developing for KDE or in Qt (or both) you must have some idea of what libraries you're supposed to be using?!

I'v only compiled really simple programs before.. I know where to find qlist.h (it's in /usr/lib/qt3/include). It has the functions in it the compiler is bitching about.

It's not the header file it wants, it's the library. Usually you use something like pkg-config to fill in the bits you need.

pkg-config --cflags --libs qt-mt

does it for Qt for me, but you may need other options to get the KDE specific libs/cflags. Put the above line in backticks (below the esc key) as part of your gcc line:

It says:

/usr/bin/ld: cannot find -l/qt-mt.pc

qt-mt.pc is located in /usr/lib/qt3/lib/pkgconfig/. Do I need to pass this directory somehow?

Anybody? Maybe suggestions on reading material..

No, you're trying to pass qt-mt.pc to the linker...that's the file used by pkgconfig, not the linker!!!

Ok, the last example I gave you...those are NOT quote marks around pkg-config (etc) they are backticks. On a US keyboard that's the key under the escape key, to the left of the 1 key.

Find some tutorial documentation for whatever system you're using (looks like Qt with some KDE specific stuff) and find out what flags you need to pass to the compiler. www.trolltech.com has a Qt tutorial which shows you how to compile their stuff, and if you search for kde programming tutorial you'll probably find something useful. I can't give any specific references, I hated programming with Qt and it's awful 'meta object compiler'