Compiling and installing to some location in /opt without sudo is not possible because it tries to install files in system directory unconditionally: CMake Error at cmake_install.cmake:79 (file): file INSTALL cannot copy file "/home/roman/dev/kde/bluez-qt/src/61-kde-bluetooth-rfkill.rules" to "/lib/udev/rules.d/61-kde-bluetooth-rfkill.rules". It should only try to install in the prefix.
*** This bug has been marked as a duplicate of bug 418328 ***