We discussed that a while ago on #debian-gnome. Building with --enable-unversioned is not really an option. We use alternatives and priorities to setup the default vala version.
An idea that I proposed, was to install those files /usr/share/aclocal/vala.m4 /usr/share/aclocal/vapigen.m4 /usr/share/vala/Makefile.vapigen In a versioned directory, say /usr/share/vala-0.16/ and also manage them via alternatives. -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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