[Bug 754004] opencv: build errors after migrating from c to cpp

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754004

Luis de Bethencourt <luis at debethencourt.com> changed:

           What    |Removed                     |Added
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                 CC|                            |luis at debethencourt.com

--- Comment #3 from Luis de Bethencourt <luis at debethencourt.com> ---
Tim is correct. I have seen this repeatedly when switching from OpenCV
development branch and master, until this was merged. Autotools doesn't clean
up for itself and generated Makefile still points to non-existing C file. You
need to clean the repo (git clean -dfx) and generate again the Makefile with
./autogen.sh

If we removed the .deps in make clean, that would require having to run
configure again after, which means it would be the same as git clean. Make
clean is there to build from scratch but not have to generate all the autotool
files again.

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