Unsupported flags in systemLibrary pkg-config files

The Qt pkg-config files ship as e.g: prefix=/Users/torarne/build/qt/6.x-prefix-no-fw/install exec_prefix=${prefix} bindir=${prefix}/bin libexecdir=${prefix}/libexec libdir=${prefix}/lib includedir=${prefix}/include Name: Qt6 Widgets Description: Qt Widgets module Version: 6.13.0 Libs: -L${libdir} -lQt6Widgets Cflags: -I${includedir}/QtWidgets -I${includedir} -DQT_WIDGETS_LIB Requires: Qt6Core Qt6Gui The -DQT_WIDGETS_LIB define is used to allow e.g. QtGui's headers to expose APIs that are only...