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	diff --git a/util/system.cpp b/util/system.cpp
	index caf8598b..bf3495dd 100644
	--- a/util/system.cpp
	+++ b/util/system.cpp
	@@ -1,37 +1,46 @@
	#include <string>
	#include "system.h"
	+#include <stdint.h>

	#ifndef WINDOWS
	#include <unistd.h>
	#include <sys/stat.h>
	+#include <sys/time.h>
	#endif

	#ifndef WINDOWS
	static bool isReadable(const std::string & path){
	if (access(path.c_str(), R_OK) == 0){
	return true;
	} else {
	return false;
	}
	}

	bool System::isDirectory(const std::string & path){
	struct stat info;
	if (stat(path.c_str(), &info) == 0){
	if (S_ISDIR(info.st_mode) == 1){
	return true;
	} else {
	return false;
	}
	}
	return false;
	}

	bool System::readableFile(const std::string & path){
	return isReadable(path) && ! isDirectory(path);
	}

	bool System::readable(const std::string & path){
	return isReadable(path);
	}
	+
	+uint64_t System::currentMicroseconds(){
	+ struct timeval hold;
	+ gettimeofday(&hold, NULL);
	+ return hold.tv_sec * 1000 * 1000 + hold.tv_usec;
	+}
	+
	#endif
	diff --git a/util/system.h b/util/system.h
	index 499878b8..43a086f0 100644
	--- a/util/system.h
	+++ b/util/system.h
	@@ -1,14 +1,16 @@
	#ifndef _paintown_system_h
	#define _paintown_system_h

	/* system utilities */

	#include <string>
	+#include <stdint.h>

	namespace System{
	bool isDirectory(const std::string & path);
	bool readableFile(const std::string & path);
	bool readable(const std::string & path);
	+ uint64_t currentMicroseconds();
	}

	#endif