diff --git a/Apple2Mac/Apple2Mac.xcodeproj/project.pbxproj b/Apple2Mac/Apple2Mac.xcodeproj/project.pbxproj
index 4f0b4e35..d58a2b80 100644
--- a/Apple2Mac/Apple2Mac.xcodeproj/project.pbxproj
+++ b/Apple2Mac/Apple2Mac.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		7751DD4E1955EFF5007F8BDF /* darwin-shim.c in Sources */ = {isa = PBXBuildFile; fileRef = 7751DD4D1955EFF5007F8BDF /* darwin-shim.c */; };
 		77A913BE19500F6000F5B902 /* QuartzCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 77A913BD19500F6000F5B902 /* QuartzCore.framework */; };
 		77A913C019500F6000F5B902 /* GLKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 77A913BF19500F6000F5B902 /* GLKit.framework */; };
 		77A913C219500F6000F5B902 /* OpenGL.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 77A913C119500F6000F5B902 /* OpenGL.framework */; };
@@ -218,6 +219,8 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		7751DD4B1955EB60007F8BDF /* darwin-shim.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "darwin-shim.h"; sourceTree = "<group>"; };
+		7751DD4D1955EFF5007F8BDF /* darwin-shim.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "darwin-shim.c"; sourceTree = "<group>"; };
 		77A913BA19500F6000F5B902 /* Apple2Mac.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Apple2Mac.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		77A913BD19500F6000F5B902 /* QuartzCore.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = QuartzCore.framework; path = System/Library/Frameworks/QuartzCore.framework; sourceTree = SDKROOT; };
 		77A913BF19500F6000F5B902 /* GLKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = GLKit.framework; path = System/Library/Frameworks/GLKit.framework; sourceTree = SDKROOT; };
@@ -1443,6 +1446,8 @@
 				77A9163A1950108F00F5B902 /* common.h */,
 				77A9163B1950108F00F5B902 /* cpu-supp.c */,
 				77A9163C1950108F00F5B902 /* cpu.h */,
+				7751DD4D1955EFF5007F8BDF /* darwin-shim.c */,
+				7751DD4B1955EB60007F8BDF /* darwin-shim.h */,
 				77A9163E1950108F00F5B902 /* disk.c */,
 				77A9163F1950108F00F5B902 /* disk.h */,
 				77A916401950108F00F5B902 /* display.c */,
@@ -1726,6 +1731,7 @@
 				77A9141C19500F6100F5B902 /* CCActionInstant.m in Sources */,
 				77A9141F19500F6100F5B902 /* CCActionInterval.m in Sources */,
 				77A9144D19500F6200F5B902 /* CCNodeColor.m in Sources */,
+				7751DD4E1955EFF5007F8BDF /* darwin-shim.c in Sources */,
 				77A916811950108F00F5B902 /* debug.l in Sources */,
 				77A914DB19500F6300F5B902 /* CCAppDelegate.m in Sources */,
 				77A9143B19500F6200F5B902 /* CCDirector.m in Sources */,
diff --git a/src/darwin-shim.c b/src/darwin-shim.c
new file mode 100644
index 00000000..bfa2afb6
--- /dev/null
+++ b/src/darwin-shim.c
@@ -0,0 +1,39 @@
+/*
+ * Apple // emulator for *nix
+ *
+ * This software package is subject to the GNU General Public License
+ * version 2 or later (your choice) as published by the Free Software
+ * Foundation.
+ *
+ * THERE ARE NO WARRANTIES WHATSOEVER.
+ *
+ */
+
+#include "common.h"
+#include "darwin-shim.h"
+#include <mach/mach_time.h>
+
+// Derived from http://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x
+// 2014/06/21
+
+#define ORWL_NANO (+1.0E-9)
+#define ORWL_GIGA UINT64_C(1000000000)
+
+static double orwl_timebase = 0.0;
+static uint64_t orwl_timestart = 0;
+
+__attribute__((constructor))
+static void __init_darwin_shim() {
+    mach_timebase_info_data_t tb = { 0 };
+    mach_timebase_info(&tb);
+    orwl_timebase = tb.numer;
+    orwl_timebase /= tb.denom;
+    orwl_timestart = mach_absolute_time();
+}
+
+int clock_gettime(int clk_id, struct timespec *tp) {
+    double diff = (mach_absolute_time() - orwl_timestart) * orwl_timebase;
+    tp->tv_sec = diff * ORWL_NANO;
+    tp->tv_nsec = diff - (tp->tv_sec * ORWL_GIGA);
+    return 0;
+}
diff --git a/src/darwin-shim.h b/src/darwin-shim.h
new file mode 100644
index 00000000..ff7d4d36
--- /dev/null
+++ b/src/darwin-shim.h
@@ -0,0 +1,25 @@
+/*
+ * Apple // emulator for *nix
+ *
+ * This software package is subject to the GNU General Public License
+ * version 2 or later (your choice) as published by the Free Software
+ * Foundation.
+ *
+ * THERE ARE NO WARRANTIES WHATSOEVER.
+ *
+ */
+
+#ifndef _CPU_REGS_H_
+#define _CPU_REGS_H_
+
+#include "common.h"
+
+#ifdef __APPLE__
+
+#define CLOCK_MONOTONIC 1
+
+int clock_gettime(int, struct timespec *);
+
+#endif // __APPLE__
+
+#endif
\ No newline at end of file