diff --git a/src_main/io/piserial.cpp b/src_main/io/piserial.cpp
index 2fe40c1d..39b74b27 100755
--- a/src_main/io/piserial.cpp
+++ b/src_main/io/piserial.cpp
@@ -63,7 +63,6 @@
 #  include <termios.h>
 #  include <fcntl.h>
 #  include <sys/ioctl.h>
-#  include <linux/serial.h>
 #  ifndef B50
 #    define B50       0000001
 #  endif
@@ -113,6 +112,9 @@
 #ifndef CRTSCTS
 #  define CRTSCTS 020000000000
 #endif
+#if defined(LINUX)
+#  include <linux/serial.h>
+#endif
 
 
 /*! \class PISerial
@@ -828,7 +830,7 @@ void PISerial::optionsChanged() {
 
 void PISerial::threadedReadBufferSizeChanged() {
 	if (!isOpened()) return;
-#ifndef WINDOWS
+#if defined(LINUX)
 	serial_struct ss;
 	ioctl(fd, TIOCGSERIAL, &ss);
 	//piCoutObj << "b" << ss.xmit_fifo_size;
diff --git a/src_main/system/pisystemmonitor.cpp b/src_main/system/pisystemmonitor.cpp
index 38db3cb8..30e6f337 100755
--- a/src_main/system/pisystemmonitor.cpp
+++ b/src_main/system/pisystemmonitor.cpp
@@ -27,11 +27,20 @@
 #  include <psapi.h>
 #  include <tlhelp32.h>
 #endif
+#ifdef MAC_OS
+#  include <sys/proc_info.h>
+#  include <libproc.h>
+#endif
 
 
 PRIVATE_DEFINITION_START(PISystemMonitor)
 #ifndef WINDOWS
-	llong cpu_u_cur, cpu_u_prev, cpu_s_cur, cpu_s_prev;
+#  ifdef MAC_OS
+	PISystemTime
+#  else
+	llong
+#  endif
+				cpu_u_cur, cpu_u_prev, cpu_s_cur, cpu_s_prev;
 	PIString proc_dir;
 	PIFile file, filem;
 #else
@@ -77,7 +86,9 @@ bool PISystemMonitor::startOnProcess(int pID, int interval_ms) {
 	stop();
 	self_ = false;
 	pID_ = pID;
+	cycle = -1;
 #ifndef WINDOWS
+#  ifndef MAC_OS
 	PRIVATE->proc_dir = PIStringAscii("/proc/") + PIString::fromNumber(pID_) + PIStringAscii("/");
 	PRIVATE->file. open(PRIVATE->proc_dir + "stat",  PIIODevice::ReadOnly);
 	PRIVATE->filem.open(PRIVATE->proc_dir + "statm", PIIODevice::ReadOnly);
@@ -85,7 +96,7 @@ bool PISystemMonitor::startOnProcess(int pID, int interval_ms) {
 		piCoutObj << "Can`t find process with ID = " << pID_ << "!";
 		return false;
 	}
-	cycle = -1;
+#  endif
 #else
 	PRIVATE->hProc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pID_);
 	if (PRIVATE->hProc == 0) {
@@ -125,6 +136,12 @@ void PISystemMonitor::stop() {
 }
 
 
+#ifdef MAC_OS
+PISystemTime uint64toST(uint64_t v) {
+	return PISystemTime(((uint*)&(v))[1], ((uint*)&(v))[0]);
+}
+#endif
+
 void PISystemMonitor::run() {
 	cur_tm.clear();
 	tbid.clear();
@@ -136,7 +153,29 @@ void PISystemMonitor::run() {
 			tbid[t->tid()] = t->name();
 	pitc->unlock();
 	//piCout << tbid.keys().toType<uint>();
+	stat.ID = pID_;
 #ifndef WINDOWS
+#  ifdef MAC_OS
+	rusage_info_current ru;
+	proc_pid_rusage(pID_, RUSAGE_INFO_CURRENT, (rusage_info_t*)&ru);
+	//piCout << PISystemTime(((uint*)&(ru.ri_user_time))[1], ((uint*)&(ru.ri_user_time))[0]);
+	if (cycle < 0) {
+		PRIVATE->cpu_u_prev = PRIVATE->cpu_u_cur = uint64toST(ru.ri_user_time);
+		PRIVATE->cpu_s_prev = PRIVATE->cpu_s_cur = uint64toST(ru.ri_system_time);
+	}
+	cycle++;
+	//if (cycle >= 4) {
+		PRIVATE->cpu_u_prev = PRIVATE->cpu_u_cur;
+		PRIVATE->cpu_s_prev = PRIVATE->cpu_s_cur;
+		PRIVATE->cpu_u_cur = uint64toST(ru.ri_user_time);
+		PRIVATE->cpu_s_cur = uint64toST(ru.ri_system_time);
+		stat.cpu_load_system = 100.f * (PRIVATE->cpu_s_cur - PRIVATE->cpu_s_prev).toMilliseconds() / delay_;
+		stat.cpu_load_user = 100.f * (PRIVATE->cpu_u_cur - PRIVATE->cpu_u_prev).toMilliseconds() / delay_;
+		//stat.cpu_load_system /= cpu_count;
+		//stat.cpu_load_user /= cpu_count;
+		cycle = 0;
+		//piCout << (PRIVATE->cpu_u_cur - PRIVATE->cpu_u_prev).toMilliseconds() / delay_;
+#  else
 	PRIVATE->file.seekToBegin();
 	PIString str(PRIVATE->file.readAll(true));
 	int si = str.find('(') + 1, fi = 0, cc = 1;
@@ -194,8 +233,8 @@ void PISystemMonitor::run() {
 			continue;
 		gatherThread(i.name().toInt());
 	}
+#  endif
 #else
-	stat.ID = pID_;
 //	HMODULE hMod;
 //	DWORD cbNeeded;
 	if (GetProcessMemoryInfo(PRIVATE->hProc, &PRIVATE->mem_cnt, sizeof(PRIVATE->mem_cnt)) != 0) {
@@ -249,7 +288,7 @@ void PISystemMonitor::run() {
 	}
 	PRIVATE->tm.reset();
 #endif
-	
+
 	stat.cpu_load_system = piClampf(stat.cpu_load_system, 0.f, 100.f);
 	stat.cpu_load_user = piClampf(stat.cpu_load_user, 0.f, 100.f);