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If you are using Plasma, it is recommended to replace in PKGBUILD _plasma=false with _plasma=true to use additional KDE API feautures (this also adds additional dependencies).

@matterhorn, @gflegar, thanks! This is due to the X11 macro conflict and the new Enum that appeared in this version of Qt. I will fix it, stay tuned for updates.

@gflegar I too ran into this problem:

g++ -c -pipe -O2 -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -std=gnu++1z -Wall -Wextra -D_REENTRANT -fPIC -DQAPPLICATION_CLASS=QApplication -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_X11EXTRAS_LIB -DQT_GUI_LIB -DQT_DBUS_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -Isrc/third-party/singleapplication -isystem /usr/include/qt -isystem /usr/include/qt/QtWidgets -isystem /usr/include/qt/QtX11Extras -isystem /usr/include/qt/QtGui -isystem /usr/include/qt/QtDBus -isystem /usr/include/qt/QtNetwork -isystem /usr/include/qt/QtCore -I. -I. -I/usr/lib/qt/mkspecs/linux-g++ -o optimusmanager.o src/optimusmanager.cpp
In file included from /usr/include/X11/Xlib.h:44,
                 from /usr/include/X11/extensions/Xrender.h:28,
                 from /usr/include/X11/extensions/Xrandr.h:33,
                 from src/x11deleters.h:4,
                 from src/optimusmanager.cpp:26:
/usr/include/qt/QtWidgets/qactiongroup.h:64:9: error: expected identifier before numeric constant
   64 |         None,
      |         ^~~~

It seems to be a conflict between the X11 headers (Xlib.h) and QT headers triggered by the order they are included. I managed to work around it with a patch to include all QT headers first, then the project headers that pull in X11, though it might only be necessary to move x11deleters.h:

--- a/src/optimusmanager.cpp    2019-12-25 15:26:34.768692953 -0500
+++ b/src/optimusmanager.cpp    2019-12-25 15:26:56.472464833 -0500
@@ -18,14 +18,6 @@
  *
  */

-#include "optimusmanager.h"
-#include "appsettings.h"
-#include "settingsdialog.h"
-#include "singleapplication.h"
-#include "optimussettings.h"
-#include "x11deleters.h"
-#include "session.h"
-
 #include <QX11Info>
 #include <QProcess>
 #include <QFileInfo>
@@ -40,6 +32,14 @@
 #include <QSystemTrayIcon>
 #endif

+#include "optimusmanager.h"
+#include "appsettings.h"
+#include "settingsdialog.h"
+#include "singleapplication.h"
+#include "optimussettings.h"
+#include "x11deleters.h"
+#include "session.h"
+
 OptimusManager::OptimusManager(QObject *parent)
     : QObject(parent)
     , m_contextMenu(new QMenu)

I'm getting build errors when trying to update this:

/usr/include/qt/QtWidgets/qactiongroup.h:64:9: error: expected identifier before numeric constant
   64 |         None,
      |         ^~~~

Probably has something to do with the new QT 5.14 release.

@Shatur I know, maybe something went wrong or those were added after my first try... Now everything works fine :)

@dartheian, this package already has these dependencies.

I solved it by installing the 'qt5-base' package explicitly. Same for 'qt5-svg'.

@indarian, could you open an issue on GitHub with more information about your setup?

@Shatur no, the only application so far is optimus-manager-qt.

@indarian, Do you have this problem in other Qt applications?

Can confirm missing icons (not only intel and nvidia, but all icons in app)