SuperBuild failed for release-7.1 (with Docker)

I'm trying a full SuperBuild of OTB 7.1 inside a docker container. My Dockerfile worked fine with v7.0 but I'm struggling to make it work with v7.1.

I tried with ubuntu 18.04 and debian 10.

Here is the error (during OTB configuration step):

CMake Warning at /usr/share/cmake-3.10/Modules/FindBoost.cmake:801 (message):
  New Boost version may have incorrect or missing dependencies and imported
  targets
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindBoost.cmake:907 (_Boost_COMPONENT_DEPENDENCIES)
  /usr/share/cmake-3.10/Modules/FindBoost.cmake:1558 (_Boost_MISSING_DEPENDENCIES)
  CMake/FindShark.cmake:58 (find_package)
  Modules/ThirdParty/Shark/otb-module-init.cmake:21 (find_package)
  CMake/OTBModuleEnablement.cmake:273 (include)
  CMakeLists.txt:332 (include)


CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find OpenCV (missing: OPENCV_core_LIBRARY) (found version
  "4.1.1")
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  CMake/FindOpenCV.cmake:141 (find_package_handle_standard_args)
  Modules/ThirdParty/OpenCV/otb-module-init.cmake:21 (find_package)
  CMake/OTBModuleEnablement.cmake:273 (include)
  CMakeLists.txt:332 (include)

I checked the container and I can see every libs in /opt/otb/lib. I tried to add cmake flags but:

CMake Warning:
  Manually-specified variables were not used by the project:

    OpenCV_core_LIBRARY
    OpenCV_ml_LIBRARY

I also tried with 'LDFLAGS="-Wl,-rpath-link,/opt/otb/lib"'

I attached the stand-alone Dockerfile and the CMakeError.log.

Any ideas ?