diff --git a/.gitignore b/.gitignore
index 2100dfc1..eedef8ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@ bld/
 [Bb]in/
 [Oo]bj/
 [Ll]og/
+[Cc]make_build/
 
 # Visual Studio 2015 cache/options directory
 .vs/
@@ -291,4 +292,10 @@ __pycache__/
 Generated Files/
 !/build/config/TRexDefs/**
 !src/Calculator/TemporaryKey.pfx
-!src/CalculatorUnitTests/CalculatorUnitTests_TemporaryKey.pfx
\ No newline at end of file
+!src/CalculatorUnitTests/CalculatorUnitTests_TemporaryKey.pfx
+
+# macOS specific
+.DS_Store
+
+# VSCode
+.vscode
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 00000000..2728e702
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 2.6)
+project(calculator)
+set(CMAKE_CXX_STANDARD 11)
+
+add_subdirectory(src)
diff --git a/README.md b/README.md
index d967b175..46181c37 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,17 @@ Calculator ships regularly with new features and bug fixes. You can get the late
 - Currency conversion based on data retrieved from [Bing](https://www.bing.com).
 
 ## Getting started
+
+### On macOS
+Prerequisites:
+- CMake
+- macOS
+
+- Create a new directory named `cmake_build` in the repository folder
+- Run `cmake .. -GXcode` from `cmake_build`
+- Run `cmake --build cmake_build` from the repository folder to build the project
+
+### On Windows
 Prerequisites:
 - Your computer must be running Windows 10, version 1803 or newer.
 - Install the latest version of [Visual Studio](https://developer.microsoft.com/en-us/windows/downloads) (the free community edition is sufficient).
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 00000000..b754a766
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(CalcManager)
diff --git a/src/CalcManager/CEngine/CalcInput.cpp b/src/CalcManager/CEngine/CalcInput.cpp
index 45e553b9..01ecddcc 100644
--- a/src/CalcManager/CEngine/CalcInput.cpp
+++ b/src/CalcManager/CEngine/CalcInput.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/CalcUtils.cpp b/src/CalcManager/CEngine/CalcUtils.cpp
index 7980e4e0..04882a4f 100644
--- a/src/CalcManager/CEngine/CalcUtils.cpp
+++ b/src/CalcManager/CEngine/CalcUtils.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 #include "Header Files/CalcUtils.h"
 
diff --git a/src/CalcManager/CEngine/History.cpp b/src/CalcManager/CEngine/History.cpp
index ca276a41..56d1fc18 100644
--- a/src/CalcManager/CEngine/History.cpp
+++ b/src/CalcManager/CEngine/History.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 #include "Command.h"
 #include "CalculatorVector.h"
diff --git a/src/CalcManager/CEngine/Number.cpp b/src/CalcManager/CEngine/Number.cpp
index 4bf83a33..7590e6d1 100644
--- a/src/CalcManager/CEngine/Number.cpp
+++ b/src/CalcManager/CEngine/Number.cpp
@@ -1,6 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/Number.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/Rational.cpp b/src/CalcManager/CEngine/Rational.cpp
index fd86b72a..64288ede 100644
--- a/src/CalcManager/CEngine/Rational.cpp
+++ b/src/CalcManager/CEngine/Rational.cpp
@@ -1,6 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/Rational.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/RationalMath.cpp b/src/CalcManager/CEngine/RationalMath.cpp
index 37dc7926..cda098b3 100644
--- a/src/CalcManager/CEngine/RationalMath.cpp
+++ b/src/CalcManager/CEngine/RationalMath.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/RationalMath.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/calc.cpp b/src/CalcManager/CEngine/calc.cpp
index 9d1ca9de..c79c5964 100644
--- a/src/CalcManager/CEngine/calc.cpp
+++ b/src/CalcManager/CEngine/calc.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 
 #include "CalculatorResource.h"
diff --git a/src/CalcManager/CEngine/scicomm.cpp b/src/CalcManager/CEngine/scicomm.cpp
index f17938bf..e5984453 100644
--- a/src/CalcManager/CEngine/scicomm.cpp
+++ b/src/CalcManager/CEngine/scicomm.cpp
@@ -12,7 +12,7 @@
 *
 * Author:
 \****************************************************************************/
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 #include "Header Files/CalcUtils.h"
 
diff --git a/src/CalcManager/CEngine/scidisp.cpp b/src/CalcManager/CEngine/scidisp.cpp
index 849fe863..f495b803 100644
--- a/src/CalcManager/CEngine/scidisp.cpp
+++ b/src/CalcManager/CEngine/scidisp.cpp
@@ -12,7 +12,7 @@
 *
 * Author:
 \****************************************************************************/
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/scifunc.cpp b/src/CalcManager/CEngine/scifunc.cpp
index a1007c1c..b094e5d0 100644
--- a/src/CalcManager/CEngine/scifunc.cpp
+++ b/src/CalcManager/CEngine/scifunc.cpp
@@ -16,7 +16,7 @@
 /***                                                                    ***/
 /***                                                                    ***/
 /**************************************************************************/
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 
 using namespace std;
diff --git a/src/CalcManager/CEngine/scioper.cpp b/src/CalcManager/CEngine/scioper.cpp
index b09083c4..b5aeff3d 100644
--- a/src/CalcManager/CEngine/scioper.cpp
+++ b/src/CalcManager/CEngine/scioper.cpp
@@ -1,7 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
 #include "Header Files/CalcEngine.h"
 
 using namespace CalcEngine;
diff --git a/src/CalcManager/CEngine/sciset.cpp b/src/CalcManager/CEngine/sciset.cpp
index 5495748e..44a4f644 100644
--- a/src/CalcManager/CEngine/sciset.cpp
+++ b/src/CalcManager/CEngine/sciset.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "pch.h"
+#include "pch_cross_platform.h"
 #include "Header Files/CalcEngine.h"
 
 using namespace CalcEngine;
diff --git a/src/CalcManager/CMakeLists.txt b/src/CalcManager/CMakeLists.txt
new file mode 100644
index 00000000..7766e95c
--- /dev/null
+++ b/src/CalcManager/CMakeLists.txt
@@ -0,0 +1,16 @@
+add_library(CalculatorEngine
+	CEngine/calc.cpp
+	CEngine/CalcInput.cpp
+	CEngine/CalcUtils.cpp
+	CEngine/History.cpp
+	CEngine/Number.cpp
+	CEngine/Rational.cpp
+	CEngine/RationalMath.cpp
+	CEngine/scicomm.cpp
+	CEngine/scidisp.cpp
+	CEngine/scifunc.cpp
+	CEngine/scioper.cpp
+	CEngine/sciset.cpp
+)
+target_compile_options(CalculatorEngine PRIVATE "-fms-extensions")
+target_include_directories(CalculatorEngine PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/src/CalcManager/CalculatorVector.h b/src/CalcManager/CalculatorVector.h
index a4de434d..4c2eb1f9 100644
--- a/src/CalcManager/CalculatorVector.h
+++ b/src/CalcManager/CalculatorVector.h
@@ -4,6 +4,13 @@
 #pragma once
 
 #include "Ratpack/CalcErr.h"
+#include <string>
+#include <vector>
+
+#ifndef _WIN32
+#include "winerror_cross_platform.h"
+#include "sal_cross_platform.h"
+#endif
 
 template <typename TType>
 class CalculatorVector
diff --git a/src/CalcManager/pch_cross_platform.cpp b/src/CalcManager/pch_cross_platform.cpp
new file mode 100644
index 00000000..1a84488d
--- /dev/null
+++ b/src/CalcManager/pch_cross_platform.cpp
@@ -0,0 +1 @@
+#include "pch_cross_platform.h"
diff --git a/src/CalcManager/pch_cross_platform.h b/src/CalcManager/pch_cross_platform.h
new file mode 100644
index 00000000..d7f50364
--- /dev/null
+++ b/src/CalcManager/pch_cross_platform.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <assert.h>
+#include <sstream>
+#include <iostream>
+#include <string>
+#include <memory>
+#include <vector>
+#include <limits>
+#include <regex>
+#include <unordered_map>
+// #include <intsafe.h>
+#include <array>
+// #include <ppltasks.h>
+#include "winerror_cross_platform.h"
diff --git a/src/CalcManager/sal_cross_platform.h b/src/CalcManager/sal_cross_platform.h
new file mode 100644
index 00000000..42b51ef7
--- /dev/null
+++ b/src/CalcManager/sal_cross_platform.h
@@ -0,0 +1,9 @@
+#pragma once
+
+// Empty macro definitions for source annotations
+
+#define _In_opt_
+#define _Out_opt_
+#define _In_
+#define _Out_
+#define _Inout_
diff --git a/src/CalcManager/winerror_cross_platform.h b/src/CalcManager/winerror_cross_platform.h
new file mode 100644
index 00000000..faa66de3
--- /dev/null
+++ b/src/CalcManager/winerror_cross_platform.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <cstdint>
+
+#define HRESULT int32_t
+#define E_ACCESSDENIED 0x80070005
+#define E_FAIL 0x80004005
+#define E_INVALIDARG 0x80070057
+#define E_OUTOFMEMORY 0x8007000E
+#define E_POINTER 0x80004003
+#define E_UNEXPECTED 0x8000FFFF
+#define E_BOUNDS 0x8000000B
+#define S_OK 0x0
+#define S_FALSE 0x1
+
+#define SUCCEEDED(hr) (((HRESULT)(hr)) >= 0)