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