c++ - #include <util/Timer.h> returns fatal error: util/Timer.h: No such file or directory

Question

This is my code. I don't understand why the compiler can't find the <util/Timer.h> header file. What did I do wrong? I have no clue , as <util/Timer.h> is not created within my project. Do I still have to add it in a cmake file as a path? I have already checked for misspelling etc. I get an "no such file or directory warning".

#include <gtest/gtest.h>


#define protected public
#define private public
#include "ShakingDevice.h"
#undef protected
#undef private

#include <limits.h>
#include "TestConfig.h"
#include <util/Timer.h>

class ShakingDeviceTest : public ::testing::Test {
 public:
  ShakingDevice *s = nullptr;

  virtual void SetUp() {
    //
  }

  virtual void TearDown() {
    //
  }
};

TEST_F(ShakingDeviceTest,testTime) {
  ASSERT_LE(abs(time - expected), 100);
}

question from:https://stackoverflow.com/questions/65871436/include-util-timer-h-returns-fatal-error-util-timer-h-no-such-file-or-direc