From 2759597bc8617039a7ffa6210f4d49a985a20093 Mon Sep 17 00:00:00 2001
From: Jonas Schnelli <dev@jonasschnelli.ch>
Date: Mon, 20 Jun 2016 10:17:01 +0200
Subject: [PATCH] Only pass -lQt5PlatformSupport if >=Qt5.6

---
 build-aux/m4/bitcoin_qt.m4 | 4 +++-
 src/qt/bitcoin.cpp         | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/build-aux/m4/bitcoin_qt.m4 b/build-aux/m4/bitcoin_qt.m4
index 210df3c02..74d910267 100644
--- a/build-aux/m4/bitcoin_qt.m4
+++ b/build-aux/m4/bitcoin_qt.m4
@@ -343,7 +343,9 @@ AC_DEFUN([_BITCOIN_QT_FIND_STATIC_PLUGINS],[
          PKG_CHECK_MODULES([QTPRINT], [Qt5PrintSupport], [QT_LIBS="$QTPRINT_LIBS $QT_LIBS"])
        fi
      else
-       QT_LIBS="-lQt5PlatformSupport $QT_LIBS"
+       if ${PKG_CONFIG} --exists "Qt5Core >= 5.6" 2>/dev/null; then
+         QT_LIBS="-lQt5PlatformSupport $QT_LIBS"
+       fi
      fi
      ])
   else
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 6218ab6ab..64b5c83d7 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -533,6 +533,9 @@ int main(int argc, char *argv[])
     // Generate high-dpi pixmaps
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #endif
+#if QT_VERSION >= 0x050600
+    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
 #ifdef Q_OS_MAC
     QApplication::setAttribute(Qt::AA_DontShowIconsInMenus);
 #endif