diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23373a9..180bf8a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,7 @@ if (APPLE)
 
 	# Set the SDK which the updater is built against.
 	# The available SDK versions are those which exist in /Developer/SDKs/
-	set(CMAKE_OSX_SDK 10.6)
+	set(CMAKE_OSX_SDK 10.7)
 
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
 	set(CMAKE_OSX_SYSROOT "/Developer/SDKs/MacOSX${CMAKE_OSX_SDK}.sdk")
diff --git a/src/FileUtils.cpp b/src/FileUtils.cpp
index 6e707e4..a98fb51 100644
--- a/src/FileUtils.cpp
+++ b/src/FileUtils.cpp
@@ -120,7 +120,7 @@ int FileUtils::fileMode(const char* path) throw (IOException)
 void FileUtils::chmod(const char* path, int mode) throw (IOException)
 {
 #ifdef PLATFORM_UNIX
-	if (::chmod(path,mode) != 0)
+	if (::chmod(path,static_cast<mode_t>(mode)) != 0)
 	{
 		throw IOException("Failed to set permissions on " + std::string(path) + " to " + intToStr(mode));
 	}
diff --git a/src/MacBundle.cpp b/src/MacBundle.cpp
index 7722317..205869e 100644
--- a/src/MacBundle.cpp
+++ b/src/MacBundle.cpp
@@ -31,10 +31,10 @@ void MacBundle::create(const std::string& infoPlist,
 		FileUtils::mkpath(binDir.c_str());
 		
 		// create the Contents/Info.plist file
-		FileUtils::writeFile((contentDir + "/Info.plist").c_str(),infoPlist.c_str(),infoPlist.size());
+		FileUtils::writeFile((contentDir + "/Info.plist").c_str(),infoPlist.c_str(),static_cast<int>(infoPlist.size()));
 
 		// save the icon to Contents/Resources/<appname>.icns
-		FileUtils::writeFile((resourceDir + '/' + m_appName + ".icns").c_str(),icon.c_str(),icon.size());
+		FileUtils::writeFile((resourceDir + '/' + m_appName + ".icns").c_str(),icon.c_str(),static_cast<int>(icon.size()));
 
 		// copy the app binary to Contents/MacOS/<appname>
 		m_exePath = binDir + '/' + m_appName;