diff --git a/sprouts.pro b/sprouts.pro
index d836adb3347..0bebabcdb0e 100644
--- a/sprouts.pro
+++ b/sprouts.pro
@@ -25,18 +25,36 @@ contains(RELEASE, 1) {
     # Mac: compile for maximum compatibility (10.6, 64-bit)
     macx:QMAKE_CXXFLAGS += -mmacosx-version-min=10.6 -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk
 
-    !windows:!macx {
+    !win32:!macx {
         # Linux: static link
         LIBS += -Wl,-Bstatic
     }
 }
 
+!win32 {
+    # for extra security against potential buffer overflows: enable GCCs Stack Smashing Protection
+    QMAKE_CXXFLAGS *= -fstack-protector-all
+    QMAKE_LFLAGS *= -fstack-protector-all
+    # Exclude on Windows cross compile with MinGW 4.2.x, as it will result in a non-working executable!
+    # This can be enabled for Windows, when we switch to MinGW >= 4.4.x.
+}
+
+# for extra security (see: https://wiki.debian.org/Hardening): this flag is GCC compiler-specific
+QMAKE_CXXFLAGS *= -D_FORTIFY_SOURCE=2
+# for extra security on Windows: enable ASLR and DEP via GCC linker flags
+win32:QMAKE_LFLAGS *= -Wl,--dynamicbase -Wl,--nxcompat
+# on Windows: enable GCC large address aware linker flag
+win32:QMAKE_LFLAGS *= -Wl,--large-address-aware -static
+# i686-w64-mingw32
+win32:QMAKE_LFLAGS *= -static-libgcc -static-libstdc++
+
 # use: qmake "USE_QRCODE=1"
 # libqrencode (http://fukuchi.org/works/qrencode/index.en.html) must be installed for support
 contains(USE_QRCODE, 1) {
     message(Building with QRCode support)
     DEFINES += USE_QRCODE
-    LIBS += -lqrencode
+    INCLUDEPATH += $$QRCODE_INCLUDE_PATH
+    LIBS += $$join(QRCODE_LIB_PATH,,-L) -lqrencode
 }
 
 # use: qmake "USE_UPNP=1" ( enabled by default; default)
@@ -50,7 +68,7 @@ contains(USE_UPNP, -) {
     count(USE_UPNP, 0) {
         USE_UPNP=1
     }
-    DEFINES += USE_UPNP=$$USE_UPNP STATICLIB
+    DEFINES += USE_UPNP=$$USE_UPNP MINIUPNP_STATICLIB
     INCLUDEPATH += $$MINIUPNPC_INCLUDE_PATH
     LIBS += $$join(MINIUPNPC_LIB_PATH,,-L,) -lminiupnpc
     win32:LIBS += -liphlpapi
@@ -74,7 +92,7 @@ contains(BITCOIN_NEED_QT_PLUGINS, 1) {
     QTPLUGIN += qcncodecs qjpcodecs qtwcodecs qkrcodecs qtaccessiblewidgets
 }
 
-!windows {
+!win32 {
     # for extra security against potential buffer overflows
     QMAKE_CXXFLAGS += -fstack-protector
     QMAKE_LFLAGS += -fstack-protector
@@ -82,7 +100,7 @@ contains(BITCOIN_NEED_QT_PLUGINS, 1) {
 }
 
 # regenerate src/build.h
-!windows || contains(USE_BUILD_INFO, 1) {
+!win32 | contains(USE_BUILD_INFO, 1) {
     genbuild.depends = FORCE
     genbuild.commands = cd $$PWD; /bin/sh share/genbuild.sh $$OUT_PWD/build/build.h
     genbuild.target = genbuildhook
@@ -348,7 +366,7 @@ windows:!contains(MINGW_THREAD_BUGFIX, 0) {
     QMAKE_LIBS_QT_ENTRY = -lmingwthrd $$QMAKE_LIBS_QT_ENTRY
 }
 
-!windows:!mac {
+!win32:!mac {
     DEFINES += LINUX
     LIBS += -lrt
 }
@@ -369,7 +387,7 @@ windows:LIBS += -lole32 -luuid -lgdi32
 LIBS += -lboost_system$$BOOST_LIB_SUFFIX -lboost_filesystem$$BOOST_LIB_SUFFIX -lboost_program_options$$BOOST_LIB_SUFFIX -lboost_thread$$BOOST_THREAD_LIB_SUFFIX
 
 contains(RELEASE, 1) {
-    !windows:!macx {
+    !win32:!macx {
         # Linux: turn dynamic linking back on for c/c++ runtime libraries
         LIBS += -Wl,-Bdynamic
     }
diff --git a/src/net.cpp b/src/net.cpp
index 07b78310ce9..1ea641b8cd5 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1714,8 +1714,12 @@ bool BindListenPort(const CService &addrBind, string& strError)
     // and enable it by default or not. Try to enable it, if possible.
     if (addrBind.IsIPv6()) {
 #ifdef IPV6_V6ONLY
+#ifdef WIN32
+        setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&nOne, sizeof(int));
+#else
         setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&nOne, sizeof(int));
 #endif
+#endif
 #ifdef WIN32
         int nProtLevel = 10 /* PROTECTION_LEVEL_UNRESTRICTED */;
         int nParameterId = 23 /* IPV6_PROTECTION_LEVEl */;
diff --git a/src/version.h b/src/version.h
index 135f80d9703..1fc74701e01 100644
--- a/src/version.h
+++ b/src/version.h
@@ -17,7 +17,7 @@
 #define PEERUNITY_VERSION_MAJOR       0
 #define PEERUNITY_VERSION_MINOR       1
 #define PEERUNITY_VERSION_REVISION    2
-#define PEERUNITY_VERSION_BUILD       2
+#define PEERUNITY_VERSION_BUILD       3
 
 static const int PEERUNITY_VERSION =
                            1000000 * PEERUNITY_VERSION_MAJOR