CMake error while adding dependency from dynalo

[Mr-Question]

Addition of dynalo to target project causes CMake error on Linux:

The CMake use case, version 3.16.2:
add_subdirectory (dynalo)

Result:
CMake Error: Error required internal CMake variable not set, cmake may not be built correctly.
Missing variable is:
CMAKE_C_COMPILE_OBJECT
-- Generating done
CMake Generate step failed. Build files cannot be regenerated correctly.
*** cmake process exited with exit code 1.

Solution:
project language should be specified both for dynalo and test projects as follows:
project(project LANGUAGES CXX)