diff --git a/src/gui/src/IpcClient.cpp b/src/gui/src/IpcClient.cpp
index 2322bc3d..04ae3999 100644
--- a/src/gui/src/IpcClient.cpp
+++ b/src/gui/src/IpcClient.cpp
@@ -106,7 +106,7 @@ void IpcClient::sendCommand(const QString& command, ElevateMode const elevate)
 
     std::string stdStringCommand = command.toStdString();
     const char* charCommand = stdStringCommand.c_str();
-    int length = strlen(charCommand);
+    int length = static_cast<int>(strlen(charCommand));
 
     char lenBuf[4];
     intToBytes(length, lenBuf, 4);
diff --git a/src/gui/src/LicenseManager.cpp b/src/gui/src/LicenseManager.cpp
index 5dcba1c8..b756bbf8 100644
--- a/src/gui/src/LicenseManager.cpp
+++ b/src/gui/src/LicenseManager.cpp
@@ -138,7 +138,7 @@ LicenseManager::getEditionName(Edition const edition, bool trial)
 	switch (edition) {
 		case kUnregistered:
 			name += " (UNREGISTERED)";
-			return QString::fromUtf8 (name.c_str(), name.size());
+			return QString::fromUtf8 (name.c_str(), static_cast<int>(name.size()));
 		case kBasic:
 			name += " Basic";
 			break;
@@ -148,7 +148,7 @@ LicenseManager::getEditionName(Edition const edition, bool trial)
 	if (trial) {
 		name += " (Trial)";
 	}
-	return QString::fromUtf8 (name.c_str(), name.size());
+	return QString::fromUtf8 (name.c_str(), static_cast<int>(name.size()));
 }
 
 void LicenseManager::notifyActivation(QString identity)
diff --git a/src/gui/src/ServerConfigDialog.cpp b/src/gui/src/ServerConfigDialog.cpp
index 38328ccf..8a94fd18 100644
--- a/src/gui/src/ServerConfigDialog.cpp
+++ b/src/gui/src/ServerConfigDialog.cpp
@@ -60,7 +60,8 @@ ServerConfigDialog::ServerConfigDialog(QWidget* parent, ServerConfig& config, co
     m_pCheckBoxEnableDragAndDrop->setChecked(serverConfig().enableDragAndDrop());
 
     m_pCheckBoxEnableClipboard->setChecked(serverConfig().clipboardSharing());
-    m_pSpinBoxClipboardSizeLimit->setValue(serverConfig().clipboardSharingSize() / 1024);
+	int clipboardSharingSizeM = static_cast<int>(serverConfig().clipboardSharingSize() / 1024);
+    m_pSpinBoxClipboardSizeLimit->setValue(clipboardSharingSizeM);
 	m_pSpinBoxClipboardSizeLimit->setEnabled(serverConfig().clipboardSharing());
 
     foreach(const Hotkey& hotkey, serverConfig().hotkeys())
@@ -222,7 +223,7 @@ void ServerConfigDialog::on_m_pCheckBoxEnableClipboard_stateChanged(int const st
 {
     m_pSpinBoxClipboardSizeLimit->setEnabled (state == Qt::Checked);
     if ((state == Qt::Checked) && (!m_pSpinBoxClipboardSizeLimit->value())) {
-        int size = (serverConfig().defaultClipboardSharingSize() + 512) / 1024;
+        int size = static_cast<int>((serverConfig().defaultClipboardSharingSize() + 512) / 1024);
         m_pSpinBoxClipboardSizeLimit->setValue (size ? size : 1);
     }
 }
diff --git a/src/lib/arch/IArchString.cpp b/src/lib/arch/IArchString.cpp
index 57365363..57208ff4 100644
--- a/src/lib/arch/IArchString.cpp
+++ b/src/lib/arch/IArchString.cpp
@@ -91,7 +91,7 @@ IArchString::convStringWCToMB(char* dst,
     }
     ARCH->unlockMutex(s_mutex);
 
-    return len;
+    return static_cast<int>(len);
 }
 
 int
@@ -141,8 +141,8 @@ IArchString::convStringMBToWC(wchar_t* dst,
             default:
                 // normal character
                 len    += 1;
-                scan   += mblen;
-                n      -= mblen;
+                scan   += static_cast<int>(mblen);
+                n      -= static_cast<int>(mblen);
                 break;
             }
         }
@@ -176,8 +176,8 @@ IArchString::convStringMBToWC(wchar_t* dst,
 
             default:
                 // normal character
-                scan   += mblen;
-                n      -= mblen;
+                scan   += static_cast<int>(mblen);
+                n      -= static_cast<int>(mblen);
                 break;
             }
         }
@@ -185,5 +185,5 @@ IArchString::convStringMBToWC(wchar_t* dst,
     }
     ARCH->unlockMutex(s_mutex);
 
-    return len;
+    return static_cast<int>(len);
 }
diff --git a/src/lib/arch/IArchSystem.h b/src/lib/arch/IArchSystem.h
index dbff79be..b5a46e25 100644
--- a/src/lib/arch/IArchSystem.h
+++ b/src/lib/arch/IArchSystem.h
@@ -56,11 +56,4 @@ public:
     */
     virtual void setting(const std::string& valueName, const std::string& valueString) const = 0;
     //@}
-
-    //! Get the pathnames of the libraries used by Synergy
-    /*
-    Returns a string containing the full path names of all loaded libraries at the point it is called.
-    */
-    virtual std::string getLibsUsed(void) const = 0;
-    //@}
 };
diff --git a/src/lib/base/Log.cpp b/src/lib/base/Log.cpp
index 3a8351b8..5ddd6b85 100644
--- a/src/lib/base/Log.cpp
+++ b/src/lib/base/Log.cpp
@@ -181,11 +181,11 @@ Log::print(const char* file, int line, const char* fmt, ...)
 
         // square brackets, spaces, comma and null terminator take about 10
         int size = 10;
-        size += strlen(timestamp);
-        size += strlen(g_priority[priority]);
-        size += strlen(buffer);
+        size += static_cast<int>(strlen(timestamp));
+        size += static_cast<int>(strlen(g_priority[priority]));
+        size += static_cast<int>(strlen(buffer));
 #ifndef NDEBUG
-        size += strlen(file);
+        size += static_cast<int>(strlen(file));
         // assume there is no file contains over 100k lines of code
         size += 6;
 #endif
diff --git a/src/lib/common/basic_types.h b/src/lib/common/basic_types.h
index 38c03998..8498ef23 100644
--- a/src/lib/common/basic_types.h
+++ b/src/lib/common/basic_types.h
@@ -18,7 +18,14 @@
 
 #pragma once
 
-#include "common/common.h"
+// VC++ has built-in sized types
+// moved from common.h (why was it there?)
+#if defined(_MSC_VER)
+#    include <wchar.h>
+#    define TYPE_OF_SIZE_1 __int8
+#    define TYPE_OF_SIZE_2 __int16
+#    define TYPE_OF_SIZE_4 __int32
+#endif
 
 //
 // pick types of particular sizes
diff --git a/src/lib/common/common.h b/src/lib/common/common.h
index 33d36f07..aa9fde18 100644
--- a/src/lib/common/common.h
+++ b/src/lib/common/common.h
@@ -27,19 +27,6 @@
 #	error "config.h missing"
 #endif
 
-// VC++ has built-in sized types
-#if defined(_MSC_VER)
-#    include <wchar.h>
-#    define TYPE_OF_SIZE_1 __int8
-#    define TYPE_OF_SIZE_2 __int16
-#    define TYPE_OF_SIZE_4 __int32
-#else
-#    define SIZE_OF_CHAR        1
-#    define SIZE_OF_SHORT    2
-#    define SIZE_OF_INT        4
-#    define SIZE_OF_LONG        4
-#endif
-
 // define NULL
 #include <stddef.h>
 
diff --git a/src/lib/io/StreamBuffer.cpp b/src/lib/io/StreamBuffer.cpp
index f8b3b010..f7cf86bd 100644
--- a/src/lib/io/StreamBuffer.cpp
+++ b/src/lib/io/StreamBuffer.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "io/StreamBuffer.h"
+#include "common/common.h"
 
 //
 // StreamBuffer
diff --git a/src/lib/net/TCPSocket.cpp b/src/lib/net/TCPSocket.cpp
index 39fce497..7a4d16e1 100644
--- a/src/lib/net/TCPSocket.cpp
+++ b/src/lib/net/TCPSocket.cpp
@@ -28,6 +28,7 @@
 #include "base/Log.h"
 #include "base/IEventQueue.h"
 #include "base/IEventJob.h"
+#include "common/convert_types.h"
 
 #include <cstring>
 #include <cstdlib>
@@ -337,7 +338,7 @@ TCPSocket::doRead()
         
         // slurp up as much as possible
         do {
-            m_inputBuffer.write(buffer, bytesRead);
+            m_inputBuffer.write(buffer, static_cast<UInt32>(bytesRead));
 
             bytesRead = ARCH->readSocket(m_socket, buffer, sizeof(buffer));
         } while (bytesRead > 0);
diff --git a/src/lib/platform/MSWindowsScreen.cpp b/src/lib/platform/MSWindowsScreen.cpp
index 080db53d..2d7ac131 100644
--- a/src/lib/platform/MSWindowsScreen.cpp
+++ b/src/lib/platform/MSWindowsScreen.cpp
@@ -47,6 +47,9 @@
 #include <comutil.h>
 #include <algorithm>
 
+// suppress warning about GetVersionEx, which is used indirectly in this compilation unit.
+#pragma warning(disable: 4996)
+
 //
 // add backwards compatible multihead support (and suppress bogus warning).
 // this isn't supported on MinGW yet AFAICT.
diff --git a/src/lib/server/Config.cpp b/src/lib/server/Config.cpp
index f83eff9a..5e43d8a5 100644
--- a/src/lib/server/Config.cpp
+++ b/src/lib/server/Config.cpp
@@ -2123,7 +2123,9 @@ ConfigReadContext::parseInterval(const ArgList& args) const
 		throw XConfigRead(*this, "invalid interval \"%{1}\"", concatArgs(args));
 	}
 
-	return Config::Interval(startValue / 100.0f, endValue / 100.0f);
+	float startInterval = static_cast<float>(startValue / 100.0f);
+	float endInterval = static_cast<float>(endValue / 100.0f);
+	return Config::Interval(startInterval, endInterval);
 }
 
 void
diff --git a/src/lib/shared/SerialKey.cpp b/src/lib/shared/SerialKey.cpp
index 7a47adfb..b3e7d3c8 100644
--- a/src/lib/shared/SerialKey.cpp
+++ b/src/lib/shared/SerialKey.cpp
@@ -60,7 +60,8 @@ SerialKey::isExpiring(time_t currentTime) const
     bool result = false;
 
     if (m_trial) {
-        if (m_warnTime <= currentTime && currentTime < m_expireTime) {
+		unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+        if ((m_warnTime <= currentTimeAsLL) && (currentTimeAsLL < m_expireTime)) {
             result = true;
         }
     }
@@ -74,7 +75,8 @@ SerialKey::isExpired(time_t currentTime) const
     bool result = false;
 
     if (m_trial) {
-        if (m_expireTime <= currentTime) {
+		unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+        if (m_expireTime <= currentTimeAsLL) {
             result = true;
         }
     }
@@ -150,8 +152,9 @@ SerialKey::daysLeft(time_t currentTime) const
     unsigned long long timeLeft =  0;
     unsigned long long const day = 60 * 60 * 24;
 
-    if (currentTime < m_expireTime) {
-        timeLeft = m_expireTime - currentTime;
+	unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+    if (currentTimeAsLL < m_expireTime) {
+        timeLeft = m_expireTime - currentTimeAsLL;
     }
 
     unsigned long long daysLeft = 0;