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cppcheck: Condition 'renderer!=NULL' is always false
    ifdef GDK_WINDOWING_X11
        char *renderer = ...
        ...
    endif
    out:
Apply Fedora patch:
    egl_dpy = get_display (display);
    From: Adam Jackson
    Date: Tue, 4 Oct 2016 13:15:39 -0400
    Subject: [PATCH] check-accelerated-gles: Use eglGetPlatformDisplay{,EXT}
    eglGetDisplay forces the implementation to guess, and in general it
    can't guess correctly. Be explicit.
    https://src.fedoraproject.org/rpms/gnome-session/blob/master/f/0001-check-accelerated-gles-Use-eglGetPlatformDisplay-EXT.patch
deprecations (gdk_error_trap_push & gdk_error_trap_pop_ignored):
    gdk_x11_display_error_trap_push (gdk_dpy);
    ...
    gdk_x11_display_error_trap_pop_ignored (gdk_dpy);
 |