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gtkdoc uses some custom generated targets as content files. However, there are still two problem. The first is that gtkdoc does not support targets which are not strings. This is being fixed in the following issue: https://github.com/mesonbuild/meson/pull/2806 The second issue is that the gtkdoc function produces a target which is triggered at install time. This makes the dependencies generation to not be triggered. This patch uses a workaround for that second issue. https://mail.gnome.org/archives/networkmanager-list/2017-December/msg00079.html