CMake plugins creates files for user root

When cmake plugin is run it shows some errors because there are no rights for accessing files.
These files belong to user root instead of user jenkins:

CMake Error: Cannot open file for write: /var/lib/jenkins/home/workspace/myproject/default/build/src/test/CMakeFiles/mytest.dir/flags.make.tmp
CMake Error: : System Error: Permission denied

Actually all directories with the schema "<name>.dir" belong to user root instead of user jenkins

On Gentoo jenkins is started with parameter "--user jenkins"!

jenkins version 1.500, cmake plugin version 1.9