I've just updated it back to 0.7.1.
Are you sure you have followed each step and checked the paths? I tried to make the instructions just cut and paste. And when I do this on my system (Linux Mint 14 which is 12.10 based) it works ok.
If you run
Code:
find /opt -name Qt5CoreConfig.cmake -print
what do you get? The -DCMAKE_PREFIX_PATH should be set to where the Qt5Core directory is.