diff --git a/2GiveCoin.pro b/2GiveCoin.pro
index 3838e61..5b7df0b 100644
--- a/2GiveCoin.pro
+++ b/2GiveCoin.pro
@@ -20,6 +20,8 @@ BDB_INCLUDE_PATH=/usr/local/opt/berkeley-db4/include
 BDB_LIB_PATH=/usr/local/opt/berkeley-db4/lib
 OPENSSL_INCLUDE_PATH=/usr/local/opt/openssl/include
 OPENSSL_LIB_PATH=/usr/local/opt/openssl/lib
+QRENCODE_INCLUDE_PATH=/usr/local/opt/qrencode/include
+QRENCODE_LIB_PATH=/usr/local/opt/qrencode/lib
 
 CONFIG += static
 
@@ -40,6 +42,8 @@ UI_DIR = build
 # use: qmake "RELEASE=1"
 contains(RELEASE, 1) {
     # Mac: compile for maximum compatibility (10.5, 32-bit)
+    # This may be broken for Qt5. 10.7 is the last version with CI. For 10.6, "support is limited."
+    # See http://doc.qt.io/qt-5/osx.html
     macx:QMAKE_CXXFLAGS += -mmacosx-version-min=10.5 -arch i386 -isysroot /Developer/SDKs/MacOSX10.5.sdk
 
     !windows:!macx {
@@ -97,6 +101,7 @@ contains(USE_DBUS, 1) {
 }
 
 QT += network
+# QT += xml
 
 # use: qmake "USE_IPV6=1" ( enabled by default; default)
 #  or: qmake "USE_IPV6=0" (disabled by default)
@@ -129,6 +134,8 @@ contains(BITCOIN_NEED_QT_PLUGINS, 1) {
 QMAKE_CXXFLAGS += -msse2
 QMAKE_CFLAGS += -msse2
 QMAKE_CXXFLAGS_WARN_ON = -fdiagnostics-show-option -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter -Wstack-protector
+# This may be necessary for other platforms besides the Mac:
+macx:QMAKE_CXXFLAGS_WARN_ON += -Wno-reserved-user-defined-literal
 
 # Input
 DEPENDPATH += src src/json src/qt
@@ -396,9 +403,30 @@ macx:DEFINES += MAC_OSX MSG_NOSIGNAL=0
 macx:ICON = src/qt/res/icons/givecoin.icns
 macx:TARGET = "2GiveCoin-Qt"
 macx:QMAKE_CFLAGS_THREAD += -pthread
+
 macx:QMAKE_LFLAGS_THREAD += -pthread
 macx:QMAKE_CXXFLAGS_THREAD += -pthread
 
+# Since Mavericks, -stdlib=libc++ is the default, and bottled homebrew
+# libraries will expect it. I am not clear what effect this will have
+# on actual deployment.
+
+# The easiest way of solving this:
+#
+#QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.9
+
+# This works all the way back to 10.7. Shouldn't work on 10.6.
+QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
+macx:QMAKE_LFLAGS += -stdlib=libc++
+macx:QMAKE_CXXFLAGS += -stdlib=libc++
+
+# There's this error thrown on OS X 10.11:
+#
+# src/serialize.h:827:10: error: class member cannot be redeclared
+#
+# I'm not sure what to conditionalize this on, so it gets its own macro.
+macx:QMAKE_CXXFLAGS += -DSERIALIZE_H_HAS_DUPLICATE_DECLARATION
+
 # Set libraries and includes at end, to use platform-defined defaults if not overridden
 INCLUDEPATH += $$BOOST_INCLUDE_PATH $$BDB_INCLUDE_PATH $$OPENSSL_INCLUDE_PATH $$QRENCODE_INCLUDE_PATH
 LIBS += $$join(BOOST_LIB_PATH,,-L,) $$join(BDB_LIB_PATH,,-L,) $$join(OPENSSL_LIB_PATH,,-L,) $$join(QRENCODE_LIB_PATH,,-L,)
diff --git a/src/qt/notificator.cpp b/src/qt/notificator.cpp
index 8028190..2329c0b 100644
--- a/src/qt/notificator.cpp
+++ b/src/qt/notificator.cpp
@@ -16,7 +16,7 @@
 #include <stdint.h>
 #endif
 
-#ifdef Q_OS_MAC
+#if QT_VERSION < 0x050000 && defined(Q_OS_MAC)
 #include <ApplicationServices/ApplicationServices.h>
 extern bool qt_mac_execute_apple_script(const QString &script, AEDesc *ret);
 #endif
@@ -46,7 +46,7 @@ Notificator::Notificator(const QString &programName, QSystemTrayIcon *trayicon,
         mode = Freedesktop;
     }
 #endif
-#ifdef Q_OS_MAC
+#if QT_VERSION < 0x050000 && defined(Q_OS_MAC)    
     // Check if Growl is installed (based on Qt's tray icon implementation)
     CFURLRef cfurl;
     OSStatus status = LSGetApplicationForInfo(kLSUnknownType, kLSUnknownCreator, CFSTR("growlTicket"), kLSRolesAll, 0, &cfurl);
@@ -225,7 +225,7 @@ void Notificator::notifySystray(Class cls, const QString &title, const QString &
 }
 
 // Based on Qt's tray icon implementation
-#ifdef Q_OS_MAC
+#if QT_VERSION < 0x050000 && defined(Q_OS_MAC)
 void Notificator::notifyGrowl(Class cls, const QString &title, const QString &text, const QIcon &icon)
 {
     const QString script(
@@ -285,7 +285,7 @@ void Notificator::notify(Class cls, const QString &title, const QString &text, c
     case QSystemTray:
         notifySystray(cls, title, text, icon, millisTimeout);
         break;
-#ifdef Q_OS_MAC
+#if 0 && defined(Q_OS_MAC)
     case Growl12:
     case Growl13:
         notifyGrowl(cls, title, text, icon);
diff --git a/src/scrypt-x86_64.S b/src/scrypt-x86_64.S
index f0a3fdd..dcc8f85 100644
--- a/src/scrypt-x86_64.S
+++ b/src/scrypt-x86_64.S
@@ -175,7 +175,7 @@
 
 
 	.text
-	.align 32
+	.align 16
 gen_salsa8_core:
 	# 0: %rdx, %rdi, %rcx, %rsi
 	movq	8(%rsp), %rdi
@@ -274,7 +274,7 @@ gen_salsa8_core:
 
 
 	.text
-	.align 32
+	.align 16
 	.globl scrypt_core
 	.globl _scrypt_core
 scrypt_core:
@@ -525,7 +525,7 @@ gen_scrypt_core_loop2:
 	xmm_salsa8_core_doubleround(); \
 
 
-	.align 32
+	.align 16
 xmm_scrypt_core:
 	# shuffle 1st block into %xmm8-%xmm11
 	movl	60(%rdi), %edx
@@ -837,7 +837,7 @@ xmm_scrypt_core_loop2:
 
 
 	.text
-	.align 32
+	.align 16
 	.globl scrypt_best_throughput
 	.globl _scrypt_best_throughput
 scrypt_best_throughput:
@@ -999,7 +999,7 @@ scrypt_best_throughput_exit:
 
 
 	.text
-	.align 32
+	.align 16
 	.globl scrypt_core_2way
 	.globl _scrypt_core_2way
 scrypt_core_2way:
@@ -1461,7 +1461,7 @@ scrypt_core_2way_loop2:
 
 
 	.text
-	.align 32
+	.align 16
 	.globl scrypt_core_3way
 	.globl _scrypt_core_3way
 scrypt_core_3way:
@@ -1828,4 +1828,4 @@ scrypt_core_3way_loop2:
 	popq	%rbx
 	ret
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/serialize.h b/src/serialize.h
index 3b3dcd4..de167be 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -824,6 +824,7 @@ class CDataStream
             vch.insert(it, first, last);
     }
 
+#ifndef SERIALIZE_H_HAS_DUPLICATE_DECLARATION    
     void insert(iterator it, std::vector<char>::const_iterator first, std::vector<char>::const_iterator last)
     {
         assert(last - first >= 0);
@@ -836,7 +837,8 @@ class CDataStream
         else
             vch.insert(it, first, last);
     }
-
+#endif
+    
 #if !defined(_MSC_VER) || _MSC_VER >= 1300
     void insert(iterator it, const char* first, const char* last)
     {