opencv-4.1.2-r3 can't apply flag contribdnn [solved]

[jms.gentoo]

Hi
I have opencv-4.1.2-r3 installed

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eix -I opencv
[I] media-libs/opencv
     Available versions:  4.1.2-r3(0/4.1.2) {contrib contribcvv contribdnn contribhdf contribsfm contribxfeatures2d cuda debug dnnsamples -download +eigen examples +features2d ffmpeg gdal gflags glog gphoto2 gstreamer gtk3 ieee1394 java jpeg jpeg2k lapack opencl opencvapps openexr opengl openmp pch png +python qt5 tesseract testprograms threads tiff v4l vaapi vtk webp xine ABI_MIPS="n32 n64 o32" ABI_RISCV="lp64 lp64d" ABI_S390="32 64" ABI_X86="32 64 x32" CPU_FLAGS_X86="avx avx2 fma3 popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="FreeBSD" PYTHON_TARGETS="python3_6 python3_7"}
     Installed versions:  4.1.2-r3(0/4.1.2)(20:11:18 22/06/2020)(eigen features2d ffmpeg jpeg opengl openmp png python qt5 threads tiff v4l vaapi -contrib -contribcvv -contribdnn -contribhdf -contribsfm -contribxfeatures2d -cuda -debug -dnnsamples -download -examples -gdal -gflags -glog -gphoto2 -gstreamer -gtk3 -ieee1394 -java -jpeg2k -lapack -opencl -opencvapps -openexr -pch -tesseract -testprograms -vtk -webp -xine ABI_MIPS="-n32 -n64 -o32" ABI_RISCV="-lp64 -lp64d" ABI_S390="-32 -64" ABI_X86="32 64 -x32" CPU_FLAGS_X86="avx avx2 fma3 popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="-FreeBSD" PYTHON_TARGETS="python3_7 -python3_6")

I want to set contribdnn id did try to set it in
in /etc/portage/package.use/media-libs

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#>media-libs/opencv-4.1.0 contrib contribdnn
=media-libs/opencv-4.1.2-r3  contrib contribdnn 

also

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USE="contribdnn" emerge -pv1 media-libs/opencv

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] media-libs/opencv-4.1.2-r3:0/4.1.2::gentoo  USE="eigen features2d ffmpeg jpeg opengl openmp png python qt5 threads tiff v4l vaapi (-contrib) (-contribcvv) (-contribdnn) (-contribhdf) (-contribsfm) (-contribxfeatures2d) (-cuda) -debug -dnnsamples -download -examples -gdal (-gflags) (-glog) -gphoto2 -gstreamer -gtk3 -ieee1394 -java -jpeg2k -lapack -opencl -opencvapps -openexr -pch (-tesseract) -testprograms (-vtk) -webp -xine" ABI_X86="32 (64) (-x32)" CPU_FLAGS_X86="avx avx2 fma3 popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" PYTHON_TARGETS="python3_7 -python3_6" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB

but emerge won't set it why?

Thanks in advance for any help

[Hu]

According to man emerge, that output means the flag is forced, masked, or removed. Looking at mask files, some architectures block it entirely, and others block it for users on stable. Based on the comments in the mask files, on x86/amd64, it is masked for stable because it is considered experimental. On the arm family, it is masked because it depends on non-keyworded supporting packages.

[GDH-gentoo]

If you are on stable amd64 branch and you really want to set the USE flags, put media-libs/opencv in /etc/portage/package.accept_keywords, in addition to package.use. Specify =media-libs/opencv-4.1.2-r3 if you want to do this only for this version and revision of the package.

The former has the effect of unmasking the USE flags, the latter actually sets them.

[jms.gentoo]

Thanks both Hu && GDH-gentoo , for your time

I have been running a base stable with some unstable and I don't remember coming across this problem.
Didn't realize you could have stable package with masked flag.

seems obvious now ..

Even more when RTFM

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The following symbols are affixed to USE flags in order to indicate their status:

              Symbol   Location    Meaning
              ──────────────────────────────────────────────────────────────

              -        prefix      not enabled (either disabled or removed)
              *        suffix      transition to or from the enabled state
              %        suffix      newly added or removed
              ()       circumfix   forced, masked, or removed
              {}       circumfix   state is bound to FEATURES settings

Again thanks for your time!
jm