I am getting: CMake Error at src/customwidgets/cmake_install.cmake:68 (FILE): file INSTALL cannot copy file "/home/radim/devel/qgis/build/output/lib/libqgis_customwidgets.so.2.3.0" to "/usr/lib/x86_64-linux-gnu/qt4/plugins/designer/libqgis_customwidgets.so.2.3.0". it seems to ignore CMAKE_INSTALL_PREFIX. Radim