1. install development tools with the Cygwin Installer, at least 
       - cvs
       - make
       - >=gcc 3.3.1
       - recent binutils
       - flex
       - byacc
       - XFree (at least base and prog)
       - cygipc
   
2. gcc-2 (for the gcc2 version)
3. ld patch for gcc3.3
4. The qt source requires yacc, which could be emulates through byacc. (It was reported that using bison doesn't work)
   Create a yacc wrapper by entering the following lines into a bash shell:

   cat >/usr/local/bin/yacc
   byacc $*
   

   Then enter RETURN and CTRL-D to close the cat command.

5. download last qt 3.2.3 sources
6. unpack the source archive

   cd <any-src-dir>
   tar -xjf qt-3.2.3-2-src.tar.bz2
   

7. create some missing links which are not set by cygwin

   ln -s /usr/lib/libcygipc.a /usr/lib/libipc.a 
   

8. prepare configuring (this creates the links in the include directory)

   cd <qt-src-dir>
   
   make -f Makefile.cvs 
   

9. configure qt with threading support, which is required for kde 3.

    echo yes | ./configure -platform cygwin-g++ -fast -plugin-imgfmt-mng -thread -no-stl \
          	-qt-zlib -qt-gif -qt-libpng -qt-libjpeg -qt-libmng -no-g++-exceptions -no-xft -no-xkb \
          	-disable-opengl -prefix /opt/qt/3.2
   

10. make 

    make
    

11. Only for qt releases older 3.2.3-2: Due to an internal qmake problem, which wasn't fixed in the recent release, the linking process may fail with an error like "cannot find -lqui" . You can fix this problem with the following hack:

    cd <qt-src-dir>
    cd lib                                
    ln -fs ../bin/cygqui-1.dll libqui.dll 
    cd ..                                 
    make
    

12. After successfull compiling, create symbolic link from the <qt-src-dir> to /usr/lib/qt3
    

    
    make -p /opt/qt/
    ln -s <qt-src-dir> /opt/qt/3.2
    

13. In the last step you should set some environment variables for accessing the qt dll's, qt applications and the man pages regardless of your current directory location.

    To ensure a permanent activation of this settings you can add the settings to /etc/profile or, which is the better way, create a script in the /etc/profile.d dir. This script will be called every time a new bash shell is opened.

    Create this script by copying the following lines into a bash shell and enter RETURN and CTRL-D to close the cat command.

    cat >/etc/profile.d/qt3.2.sh 
    export QTDIR=/opt/qt/3.2
    export PATH=$QTDIR/bin:$PATH
    export MANPATH=$MANPATH:$QTDIR/doc/man
    

    At last you should reread the environment to activate this settings for your current bash shell with

    . /etc/profile
    

    After this step you are ready to use your qt release. See the Using QT3 page for further informations.

a little note: If you are using qmake for a project outsite the qt installation path you have to use qmake with the -cache option to find the building environment.

qmake -cache /opt/qt/3.2/.qmake.cache