[100%] Linking CXX executable testing.exe
CMakeFiles/testing.dir/src/main.cpp.o:main.cpp:(.rdata$.refptr.millis[.refptr.get]+0x0): undefined reference to `get'
CMakeFiles/testing.dir/src/main.cpp.o:main.cpp:(.rdata$.refptr.delay[.refptr.set]+0x0): undefined reference to `set'
collect2: error: ld returned 1 exit status
make[3]: *** [CMakeFiles/testing.dir/build.make:226: testing.exe] Error 1
make[2]: *** [CMakeFiles/Makefile2:68: CMakeFiles/testing.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:80: CMakeFiles/testing.dir/rule] Error 2
make: *** [Makefile:118: testing] Error 2