Fix FTBFS with Qt 6.8

PKGBUILD

@@ -26,6 +26,8 @@ validpgpkeys=(CA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7  # Albert Astals Cid <aac
               D81C0CB38EB725EF6691C385BB463350D6EF31EF) # Heiko Becker <heiko.becker@kde.org>
 
 build() {
+# Fix FTBFS with Qt 6.8 https://bugs.kde.org/show_bug.cgi?id=490863
+  CXXFLAGS+=" -I $PWD/$pkgname-$pkgver/src/lib/models -I $PWD/$pkgname-$pkgver/src/lib/datatypes"
   cmake -B build -S $pkgname-$pkgver \
     -DBUILD_TESTING=OFF \
     -DBUILD_QCH=ON \