Tests/IncludeDirectoriesCPATH/viacpath/systemlib.h - cmake - Git at Google

 #ifndef SYSTEMLIB_H
 #define SYSTEMLIB_H

 int systemlib()
 {
   return 0;
 }

 int unusedFunc()
 {
   int unused;
   return systemlib();
 }

 #endif
	#ifndef SYSTEMLIB_H
	#define SYSTEMLIB_H

	int systemlib()
	{
	return 0;
	}

	int unusedFunc()
	{
	int unused;
	return systemlib();
	}

	#endif