Install packages:

For general build:
gcc9
gcc9-c++
gcc9-devel
gcc9-c++-devel

python3-devel

patterns-devel-base-devel_basis

libopenssl-devel

libcurl-devel

libcgroup-devel

For OpenSubDiv:
libglfw3

For OpenImageIO:
libtiff-devel
libjpeg-devel
libpng-devel

For USD:
glproto-devel


For GPU, CUDA Toolkit only from Nvidia repo:
cuda-toolkit-11-1


Change in building/python-config.jam to:

using python : 3.9
  : "/installs/python/bin/python3.9"
  : "/installs/python/include/python3.9"
  : "/installs/python/lib"
  ;

Add/Change in building/CMakeLists.txt to:

set(PYTHON_VER 3.9)
set(PYTHON_ROOT /installs/python)

For Boost on line with BUILD_COMMAND, after -j64:
define=_GLIBCXX_USE_CXX11_ABI=0

For JsonCpp:
-DJSONCPP_WITH_TESTS=NO
-DSONCPP_WITH_POST_BUILD_UNITTEST=NO

For OpenSubdiv:
-DNO_DOC=1

For OpenColorIO:
-Dpystring_CXX_FLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'

For USD:
-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
-DPYTHON_EXECUTABLE=<INSTALL_DIR>/python/bin/python3.9
-DPYTHON_INCLUDE_DIRS=<INSTALL_DIR>/python/include/python3.9
-DPYTHON_LIBRARIES=<INSTALL_DIR>/python/lib
-DPXR_PY_UNDEFINED_DYNAMIC_LOOKUP=ON

Before build:
Set update-alternatives
to use gcc9, g++9

Get static Python 3.9.2 (with headers files for building) from Blender SVN repo:
git svn clone https://svn.blender.org/svnroot/bf-blender/tags/blender-2.93-release/lib/linux_centos7_x86_64/python/

Place it in:
/installs/python

Make virtual Python 3.9.2 environment via python/bin/python3.9:
./python3.9 -m venv /installs/python/venv


For compatibility add libs files to appropriate folders in /installs/ for:
libtiff, licgroup, libnsl2 and libopenssl

For GPU aslo:
libcudart


Activate virtual Python 3.9.2 environment:
source /installs/python/venv/bin/activate

Set ENV to:

export CC=gcc
export CXX=g++

export CFLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'
export CXXFLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'


For Python 3.9 also:

export Python_USE_STATIC_LIBS=TRUE
export Python3_USE_STATIC_LIBS=TRUE

export Python_ROOT_DIR='/installs/python'
export PYTHON_ROOT_DIR='/installs/python'

export Python_EXECUTABLE='/installs/python/bin/python3.9'
export PYTHON_EXECUTABLE='/installs/python/bin/python3.9'

export Python_INCLUDE_DIR='/installs/python/include/python3.9'
export PYTHON_INCLUDE_DIRS='/installs/python/include/python3.9'

export Python_LIBRARIES='/installs/python/lib'
export PYTHON_LIBRARIES='/installs/python/lib'

export Python_LIBRARY='/installs/python/lib/libpython3.9.a'
export Python_LIBRARY_DIRS='/installs/python/lib'

export Python3_ROOT_DIR='/installs/python'
export PYTHON3_ROOT_DIR='/installs/python'

export Python3_EXECUTABLE='/installs/python/bin/python3.9'
export PYTHON3_EXECUTABLE='/installs/python/bin/python3.9'

export Python3_INCLUDE_DIR='/installs/python/include/python3.9'
export PYTHON3_INCLUDE_DIRS='/installs/python/include/python3.9'

export Python3_LIBRARIES='/installs/python/lib'
export PYTHON3_LIBRARIES='/installs/python/lib'

export Python3_LIBRARY='/installs/python/lib/libpython3.9.a'
export Python3_LIBRARY_DIRS='/installs/python/lib'


Enter su --preserve-environment, then:

cmake ../building
cmake --build . -- -j 64 -l 1.0 -k




For GUI install:
libqt5-qtbase-devel
libqt5-qtscript-devel

Change in

/openmoonray/build_scripts/ispc_dso_generate

and

/openmoonray/cmake_modules/build_scripts/ispc_dso_generate

this first line:
#!/bin/env python

to:
#!/usr/bin/env python


Activate virtual Python 3.9.2 environment:
source /installs/python/venv/bin/activate


For ENV set:

export CC=gcc
export CXX=g++

export CFLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'
export CXXFLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'


For Python 3.9 also:

export Python_USE_STATIC_LIBS=TRUE
export Python3_USE_STATIC_LIBS=TRUE

export Python_ROOT_DIR='/installs/python'
export PYTHON_ROOT_DIR='/installs/python'

export Python_EXECUTABLE='/installs/python/bin/python3.9'
export PYTHON_EXECUTABLE='/installs/python/bin/python3.9'

export Python_INCLUDE_DIR='/installs/python/include/python3.9'
export PYTHON_INCLUDE_DIRS='/installs/python/include/python3.9'

export Python_LIBRARIES='/installs/python/lib'
export PYTHON_LIBRARIES='/installs/python/lib'

export Python_LIBRARY='/installs/python/lib/libpython3.9.a'
export Python_LIBRARY_DIRS='/installs/python/lib'

export Python3_ROOT_DIR='/installs/python'
export PYTHON3_ROOT_DIR='/installs/python'

export Python3_EXECUTABLE='/installs/python/bin/python3.9'
export PYTHON3_EXECUTABLE='/installs/python/bin/python3.9'

export Python3_INCLUDE_DIR='/installs/python/include/python3.9'
export PYTHON3_INCLUDE_DIRS='/installs/python/include/python3.9'

export Python3_LIBRARIES='/installs/python/lib'
export PYTHON3_LIBRARIES='/installs/python/lib'

export Python3_LIBRARY='/installs/python/lib/libpython3.9.a'
export Python3_LIBRARY_DIRS='/installs/python/lib'



For GPU:
export PATH=/usr/local/cuda/bin:${PATH}

Enter su -p, then:

For CLI Only:
cmake --preset container-release -DMOONRAY_USE_CUDA=NO -DBUILD_QT_APPS=NO

For CLI+GUI only:
cmake --preset container-release -DMOONRAY_USE_CUDA=NO

For CLI+GUI+GPU (Full):
cmake --preset container-release

cmake --build --preset container-release -- -j 64 -l 1.0 -k

Afterwards virtual Python 3.9.2 environment (/installs/python/venv) can be removed:
rm -R /installs/python/venv




hd_render requires internet

To run with Python 3.9:
export PYTHONHOME=/installs/python

In case libnsl2 not detected:
ln -s /installs/lib64/libnsl.so.2 /usr/lib64/libnsl.so.2