From ff6c3a9e3485ab0d3ce3687b9795555453b699d0 Mon Sep 17 00:00:00 2001
From: adisbladis <adisbladis@gmail.com>
Date: Fri, 11 Sep 2020 18:55:29 +0200
Subject: [PATCH] qtstyleplugins: Fix build with qt>=5.15

---
 .../libraries/qtstyleplugins/default.nix      |  2 +
 .../fix-build-against-Qt-5.15.patch           | 44 +++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 pkgs/development/libraries/qtstyleplugins/fix-build-against-Qt-5.15.patch

diff --git a/pkgs/development/libraries/qtstyleplugins/default.nix b/pkgs/development/libraries/qtstyleplugins/default.nix
index ac5755f7c3d9..1970dd183c1c 100644
--- a/pkgs/development/libraries/qtstyleplugins/default.nix
+++ b/pkgs/development/libraries/qtstyleplugins/default.nix
@@ -10,6 +10,8 @@ mkDerivation {
     sha256 = "085wyn85nrmzr8nv5zv7fi2kqf8rp1gnd30h72s30j55xvhmxvmy";
   };
 
+  patches = [ ./fix-build-against-Qt-5.15.patch ];
+
   nativeBuildInputs = [ pkgconfig qmake ];
   buildInputs = [ gtk2 ];
 
diff --git a/pkgs/development/libraries/qtstyleplugins/fix-build-against-Qt-5.15.patch b/pkgs/development/libraries/qtstyleplugins/fix-build-against-Qt-5.15.patch
new file mode 100644
index 000000000000..7eb744158204
--- /dev/null
+++ b/pkgs/development/libraries/qtstyleplugins/fix-build-against-Qt-5.15.patch
@@ -0,0 +1,44 @@
+From 335dbece103e2cbf6c7cf819ab6672c2956b17b3 Mon Sep 17 00:00:00 2001
+From: Fabian Vogt <fvogt@suse.de>
+Date: Thu, 28 May 2020 12:35:42 +0200
+Subject: [PATCH] fix build against Qt 5.15
+
+With 0a93db4d82c051164923a10e4382b12de9049b45 ("Unify application
+palette handling between QGuiApplication and QApplication")
+QApplicationPrivate::setSystemPalette is no longer used and necessary.
+---
+ src/plugins/styles/gtk2/qgtkstyle.cpp   | 2 ++
+ src/plugins/styles/gtk2/qgtkstyle_p.cpp | 2 ++
+ 2 files changed, 4 insertions(+)
+
+diff --git a/src/plugins/styles/gtk2/qgtkstyle.cpp b/src/plugins/styles/gtk2/qgtkstyle.cpp
+index 36169c9..2544593 100644
+--- a/src/plugins/styles/gtk2/qgtkstyle.cpp
++++ b/src/plugins/styles/gtk2/qgtkstyle.cpp
+@@ -440,7 +440,9 @@ void QGtkStyle::polish(QApplication *app)
+     // not supported as these should be entirely determined by
+     // current Gtk settings
+     if (app->desktopSettingsAware() && d->isThemeAvailable()) {
++#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+         QApplicationPrivate::setSystemPalette(standardPalette());
++#endif
+         QApplicationPrivate::setSystemFont(d->getThemeFont());
+         d->applyCustomPaletteHash();
+         if (!d->isKDE4Session())
+diff --git a/src/plugins/styles/gtk2/qgtkstyle_p.cpp b/src/plugins/styles/gtk2/qgtkstyle_p.cpp
+index e57b3d8..e71beb0 100644
+--- a/src/plugins/styles/gtk2/qgtkstyle_p.cpp
++++ b/src/plugins/styles/gtk2/qgtkstyle_p.cpp
+@@ -508,7 +508,9 @@ void QGtkStyleUpdateScheduler::updateTheme()
+       if (oldTheme != QGtkStylePrivate::getThemeName()) {
+           oldTheme = QGtkStylePrivate::getThemeName();
+           QPalette newPalette = qApp->style()->standardPalette();
++#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+           QApplicationPrivate::setSystemPalette(newPalette);
++#endif
+           QApplication::setPalette(newPalette);
+           if (!QGtkStylePrivate::instances.isEmpty()) {
+               QGtkStylePrivate::instances.last()->initGtkWidgets();
+-- 
+2.26.2
+