Compiler prerequisites:
-----------------------
on 64bit systems: 
sudo apt-get install ia32-libs libc6-i386 libc6-dev-i386 lib32gcc1 lib32z1-dev g++-multilib

for win-crosscompile:
sudo apt-get install mingw32

Libraries needed:
------------------------------
Get static qt-builds for windows from unetbootin and extract to winbuild/qt4.5
http://launchpad.net/unetbootin/trunk/trunk/+download/qt4.5-win.7z

Get static qt-builds for linux from unetbootin and extract to linbuild/qt4.5
http://launchpad.net/unetbootin/trunk/trunk/+download/qt4.5-x11.7z

Putting a symlink to libstdc++.a in linbuild/lib includes libstdc in the executable.

Build:
------
comment out libs-line in gpg4usb.pro
Build start_windows.exe
make clean
./qmake-windows.sh
make

make clean
./qmake-linux.sh
make

Useful Links:
---------------------
http://sourceforge.net/apps/trac/unetbootin/wiki/compile
http://www.trilithium.com/johan/2005/06/static-libstdc/

Coding Style:
-------------
http://techbase.kde.org/Policies/Kdelibs_Coding_Style

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Building qt yourself (see http://sourceforge.net/apps/trac/unetbootin/wiki/compile)
Download Qt-Sources, untar and build static(for 32bit)
http://get.qt.nokia.com/qt/source/qt-x11-opensource-src-4.5.2.tar.gz

./configure -no-xrandr -no-xinerama -no-glib -no-sm -no-webkit -qt-zlib -qt-libpng -no-qt3support -no-phonon -no-phonon-backend -no-gtkstyle -static -nomake examples -nomake demos -nomake docs -opensource -prefix ~/qt-x11-opensource-src-4.5.2 -platform linux-g++-32 -no-exceptions -qt-libjpeg

make && make install

mv ~/qt-x11-opensource-src-4.5.2 linbuild/qt4.5