@roger64 - is there anything that didn't work or wasn't clear about the build instructions?
Code:
mkdir $HOME/sigil-run
mkdir $HOME/sigil-build
cd $HOME/sigil-build
export LD_LIBRARY_PATH=/opt/Qt5.0.1/5.0.1/gcc/lib
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$HOME/tmp/sigil-run -DCMAKE_BUILD_TYPE=Release -DFORCE_BUNDLED_COPIES=1 $HOME/sigil-source
$HOME/sigil-run/bin/sigil
Its about as easy as I could make it. Granted, its not a .deb for you to install - but as DiapDealer mentioned, maybe someone can compile and make it available as one, with Qt 5.0.1.
As far as the instructions go, I think I'll split it into build and run so its clear you always need to include the LD_LIBRARY_PATH, which you can easily do in a script.
And since you mention Spellchecking - how is this version working for you. The issue with apostrophes should be sorted out - well, at least better than it was hopefully.