Issue opening cmake file

Just did set up fresh Linux Mint 18.1 x64 with latest Qt 5.8 RC dated Dec 1 2016 from your website. I also pulled my cmake project from repo and did try to load it. Please mind that this all is fresh install. I got cmake error that I will list below. The strange thing is that I am also able to load same project with same Qt version on my Linux Mint 18.1 x64 VM running in Parallels 12 on my Mac. Except in my VM I did run previous version of Qt versus my desktop is fresh clean install.

When I load my cmake project first time I get this error

Running "/usr/bin/cmake /home/robert/projects/bus '-GCodeBlocks - Unix Makefiles' -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_CXX_COMPILER:STRING=/usr/bin/g++ -DCMAKE_C_COMPILER:STRING= -DCMAKE_PREFIX_PATH:STRING=/opt/Qt/5.8/gcc_64 -DQT_QMAKE_EXECUTABLE:STRING=/opt/Qt/5.8/gcc_64/bin/qmake" in /tmp/qtc-cmake-JyKWCV.
– The CXX compiler identification is GNU 5.4.0
– The C compiler identification is unknown
– Check for working CXX compiler: /usr/bin/g++
– Check for working CXX compiler: /usr/bin/g++ – works
– Detecting CXX compiler ABI info
– Detecting CXX compiler ABI info - done
– Detecting CXX compile features
– Detecting CXX compile features - done
CMake Error at CMakeLists.txt:15 (project):
No CMAKE_C_COMPILER could be found.

Tell CMake where to find the compiler by setting either the environment
variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
the compiler, or to the compiler name if it is in the PATH.

– Configuring incomplete, errors occurred!
See also "/tmp/qtc-cmake-JyKWCV/CMakeFiles/CMakeOutput.log".
See also "/tmp/qtc-cmake-JyKWCV/CMakeFiles/CMakeError.log".

• • • cmake process exited with exit code 1.

If you look at attached screen-shot You see that
Compiler C: is <No compiler> // Should this be GCC?
Compiler C++ is GCC // And this G++?

Also please auto detected Compilers section in attached screen shot