added extra/kwin

extra/kwin/PKGBUILD

@@ -0,0 +1,39 @@
+# Maintainer: Felix Yan <felixonmars@archlinux.org>
+# Maintainer: Antonio Rojas <arojas@archlinux.org>
+# Contributor: Andrea Scarpino <andrea@archlinux.org>
+
+# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
+#  - explicitly link v5/v6 with libatomic
+
+pkgname=kwin
+pkgver=5.21.0
+pkgrel=1
+pkgdesc='An easy to use, but flexible, composited Window Manager'
+arch=(x86_64)
+url='https://kde.org/plasma-desktop/'
+license=(LGPL)
+depends=(kscreenlocker xcb-util-cursor plasma-framework kcmutils kwayland-server breeze
+         qt5-script pipewire libqaccessibilityclient lcms2)
+makedepends=(extra-cmake-modules qt5-tools kdoctools krunner)
+optdepends=('qt5-virtualkeyboard: virtual keyboard support for kwin-wayland')
+groups=(plasma)
+source=("https://download.kde.org/stable/plasma/$pkgver/$pkgname-$pkgver.tar.xz"{,.sig})
+install=$pkgname.install
+sha256sums=('dcf0e4c152707f9134e2165279ae6acdf6e3f7522812f44afb9aa4779899e5a1'
+            'SKIP')
+validpgpkeys=('2D1D5B0588357787DE9EE225EC94D18F7F05997E'  # Jonathan Riddell <jr@jriddell.org>
+              '0AAC775BB6437A8D9AF7A3ACFE0784117FBCE11D'  # Bhushan Shah <bshah@kde.org>
+              'D07BD8662C56CB291B316EB2F5675605C74E02CF'  # David Edmundson <davidedmundson@kde.org>
+              '1FA881591C26B276D7A5518EEAAF29B42A678C20') # Marco Martin <notmart@gmail.com>
+
+build() {
+  [[ $CARCH == "arm" || $CARCH == "armv6h" ]] && echo "target_link_libraries(kwin atomic)" >> ${pkgname}-${pkgver}/CMakeLists.txt
+  cmake -B build -S $pkgname-$pkgver \
+    -DCMAKE_INSTALL_LIBEXECDIR=lib \
+    -DBUILD_TESTING=OFF
+  cmake --build build
+}
+
+package() {
+  DESTDIR="$pkgdir" cmake --install build
+}

extra/kwin/kwin.install

@@ -0,0 +1,9 @@
+post_install() {
+# this is executed by make install, but doesn't work since setcap can only be run as root
+  setcap CAP_SYS_NICE=+ep /usr/bin/kwin_wayland
+}
+
+post_upgrade() {
+  post_install
+}
+