diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2728e702..db306038 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 2.6)
 project(calculator)
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 
 add_subdirectory(src)
diff --git a/src/CalcManager/CEngine/calc.cpp b/src/CalcManager/CEngine/calc.cpp
index 92a551e2..74456c4f 100644
--- a/src/CalcManager/CEngine/calc.cpp
+++ b/src/CalcManager/CEngine/calc.cpp
@@ -8,9 +8,11 @@
 #endif
 
 #include "Header Files/CalcEngine.h"
-
 #include "CalculatorResource.h"
 
+#include <memory>
+#include <string_view>
+
 using namespace std;
 using namespace CalcEngine;
 
@@ -24,8 +26,8 @@ static constexpr int32_t DEFAULT_RADIX = 10;
 
 static constexpr wchar_t DEFAULT_DEC_SEPARATOR = L'.';
 static constexpr wchar_t DEFAULT_GRP_SEPARATOR = L',';
-static constexpr wstring_view DEFAULT_GRP_STR = L"3;0";
-static constexpr wstring_view DEFAULT_NUMBER_STR = L"0";
+static const wstring_view DEFAULT_GRP_STR = L"3;0";
+static const wstring_view DEFAULT_NUMBER_STR = L"0";
 
 // Read strings for keys, errors, trig types, etc.
 // These will be copied from the resources to local memory.
diff --git a/src/CalcManager/CEngine/scidisp.cpp b/src/CalcManager/CEngine/scidisp.cpp
index de4fd715..a8c9b3ef 100644
--- a/src/CalcManager/CEngine/scidisp.cpp
+++ b/src/CalcManager/CEngine/scidisp.cpp
@@ -26,8 +26,8 @@ using namespace CalcEngine;
 
 constexpr int MAX_EXPONENT = 4;
 constexpr uint32_t MAX_GROUPING_SIZE = 16;
-constexpr wstring_view c_decPreSepStr = L"[+-]?(\\d*)[";
-constexpr wstring_view c_decPostSepStr = L"]?(\\d*)(?:e[+-]?(\\d*))?$";
+const wstring_view c_decPreSepStr = L"[+-]?(\\d*)[";
+const wstring_view c_decPostSepStr = L"]?(\\d*)(?:e[+-]?(\\d*))?$";
 
 
 /****************************************************************************\
diff --git a/src/CalcManager/Header Files/CalcEngine.h b/src/CalcManager/Header Files/CalcEngine.h
index 48597f1c..d44a1b8c 100644
--- a/src/CalcManager/Header Files/CalcEngine.h	
+++ b/src/CalcManager/Header Files/CalcEngine.h	
@@ -32,6 +32,8 @@
 #include "Rational.h"
 #include "RationalMath.h"
 
+#include <array>
+
 // The following are NOT real exports of CalcEngine, but for forward declarations
 // The real exports follows later
 
diff --git a/src/CalcManager/Header Files/EngineStrings.h b/src/CalcManager/Header Files/EngineStrings.h
index 2ada6bba..2e58c283 100644
--- a/src/CalcManager/Header Files/EngineStrings.h	
+++ b/src/CalcManager/Header Files/EngineStrings.h	
@@ -13,6 +13,11 @@
 * Created: 13-Feb-2008
 *
 \****************************************************************************/
+
+#pragma once
+
+#include <string>
+
 #define IDS_FIRSTENGSTR     IDS_ENGINESTR_FIRST
 
 #define IDS_DECIMAL     4
diff --git a/src/CalcManager/win_data_types_cross_platform.h b/src/CalcManager/win_data_types_cross_platform.h
index daa99bd6..b4178a83 100644
--- a/src/CalcManager/win_data_types_cross_platform.h
+++ b/src/CalcManager/win_data_types_cross_platform.h
@@ -6,6 +6,7 @@ typedef uint64_t ULONGLONG;
 typedef int INT;
 typedef char CHAR;
 typedef long LONG;
+typedef unsigned char BYTE;
 typedef unsigned int UINT_PTR;
 typedef unsigned long ULONG_PTR;
 typedef unsigned int ULONG32;
@@ -21,3 +22,5 @@ typedef ULONG_PTR DWORD_PTR;
 #define HIWORD(dw) ((WORD)((((DWORD_PTR)(dw)) >> 16) & 0xffff))
 #define LODWORD(qw) ((DWORD)(qw))
 #define HIDWORD(qw) ((DWORD)(((qw) >> 32) & 0xffffffff))
+
+#define ARRAYSIZE(a) (sizeof(a) / sizeof(*a))
diff --git a/src/CalcManager/winerror_cross_platform.h b/src/CalcManager/winerror_cross_platform.h
index 6961e77f..4c6730c0 100644
--- a/src/CalcManager/winerror_cross_platform.h
+++ b/src/CalcManager/winerror_cross_platform.h
@@ -16,3 +16,4 @@ typedef int32_t HRESULT;
 
 #define SUCCEEDED(hr) (((HRESULT)(hr)) >= 0)
 #define FAILED(hr) (((HRESULT)(hr)) < 0)
+#define SCODE_CODE(sc) ((sc) & 0xFFFF)