opencv-devel will not compile with the latest ocl.hpp from opencv-devel

[Poikilos]

opencv-devel

NOTE: as of Fedora 29, opencv-devel is opencv 3.4.1
where ocl.hpp is totally DIFFERENT according to https://stackoverflow.com/questions/34422276/opencv-3-0-error-include-ocl-hpp
not in readme, but if missing, prevents pip install https://github.com/dthpham/butterflow/archive/master.zip:

   /tmp/pip-req-build-m6c87h1b/butterflow/avinfo.c:5:10: fatal error: libavcodec/avcodec.h: No such file or directory
    #include <libavcodec/avcodec.h>
             ^~~~~~~~~~~~~~~~~~~~~~
   compilation terminated.
   error: command 'gcc' failed with exit status 1

could be solved by ffmpeg-compat-devel as per https://ask.fedoraproject.org/en/question/31642/how-to-install-libav-devel-packages-properly/

• but I installed ffmpeg-devel
  • but error still occurs since ffmpeg has the h in ffmpeg/libavcodec/avcodec.h so edited butterflow/butterflow/avinfo.c to use that path still had error:

   In file included from /tmp/pip-req-build-uquwiwd3/butterflow/avinfo.c:5:
   /usr/include/ffmpeg/libavcodec/avcodec.h:31:10: fatal error: libavutil/samplefmt.h: No such file or directory
    #include "libavutil/samplefmt.h"
             ^~~~~~~~~~~~~~~~~~~~~~~
   compilation terminated.
   error: command 'gcc' failed with exit status 1

so changed the two libavutil lines to use ffmpeg/libavutil as the path new error:

   In file included from /tmp/pip-req-build-webiqhd6/butterflow/avinfo.c:5:
   /usr/include/ffmpeg/libavcodec/avcodec.h:31:10: fatal error: libavutil/samplefmt.h: No such file or directory
    #include "libavutil/samplefmt.h"
             ^~~~~~~~~~~~~~~~~~~~~~~
   compilation terminated.
   error: command 'gcc' failed with exit status 1

Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-req-build-webiqhd6/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-zettjosz/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-req-build-webiqhd6/

• according to Eric Stdlib on https://stackoverflow.com/questions/47562170/how-to-include-avcodec-h-in-c-in-fedora
  the problem is solved by adding -I /usr/include/ffmpeg to the gcc command.
  • I reverted back to the original butterflow/butterflow/avinfo.c (removed each ffmpeg/ added above)
  • Path (-I) can be added via pip as per https://stackoverflow.com/questions/18783390/python-pip-specify-a-library-directory-and-an-include-directory
    (see install-as-user)
• another error remains:

   /tmp/pip-req-build-gRg1yS/butterflow/ocl.cpp:10:10: fatal error: opencv2/ocl/ocl.hpp: No such file or directory
    #include <opencv2/ocl/ocl.hpp>
             ^~~~~~~~~~~~~~~~~~~~~
   compilation terminated.
   error: command 'gcc' failed with exit status 1

   ----------------------------------------

Command "/usr/bin/python2 -u -c "import setuptools, tokenize;__file__='/tmp/pip-req-build-gRg1yS/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-RA_EcH/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-req-build-gRg1yS/

• apparently since "opencv-ocl package or you did not compile your opencv with OCL activated." (see Missing opencv2/ocl/ocl.hpp slowmoVideo/slowmoVideo#36)
  but there is no such package. locate says file is installed at: /usr/include/boost/compute/interop/opencv/ocl.hpp
  so added interop to include path, but that doesn't work.
• Tried to install compat package from copr (see https://copr.fedorainfracloud.org/coprs/thofmann/opencv2/)

dnf -y install libav
# dnf -y copr enable thofmann/opencv2
# allowerasing will remove opencv (such as 3.0) if installed
# dnf -y --allowerasing install opencv2
# but install fails:
# Failed to synchronize cache for repo 'thofmann-opencv2', ignoring this repo.
# No match for argument: opencv2
# Error: Unable to find a match
#      * changing releasever to 26 doesn't work either (last build of thofmann-opencv2 <https://copr-be.cloud.fedoraproject.org/results/thofmann/opencv2/fedora-26-x86_64/repodata/>)
# No match for argument: opencv2
# Error: Unable to find a match

• tried installing python2-opencv, but as expected that did not help.
• so try including modules/ocl/include manually (see install-as-user)