diff --git a/opencv.spec b/opencv.spec
index 2329e98..dbe7b42 100644
--- a/opencv.spec
+++ b/opencv.spec
@@ -1,8 +1,8 @@
 %define pkgver %(echo %version | sed "s|[a-z]||")
 %define javaver %(echo %version | cut -d. -f1-3 | tr -d .)
 Name:          opencv
-Version:       4.1.2
-Release:       4mamba
+Version:       4.5.0
+Release:       1mamba
 Summary:       Collection of algorithms for computer vision
 Group:         Development/Libraries
 Vendor:        openmamba
@@ -19,38 +19,32 @@ Patch4:        opencv-4.1.2-cmake-includedir.patch
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: libatk-devel
+BuildRequires: ldconfig
 BuildRequires: libavcodec-ffmpeg-devel
 BuildRequires: libavformat-ffmpeg-devel
-BuildRequires: libavresample-ffmpeg-devel
 BuildRequires: libavutil-ffmpeg-devel
 BuildRequires: libcairo-devel
 BuildRequires: libdc1394-devel
-BuildRequires: libexif-devel
 BuildRequires: libgcc
 BuildRequires: libgdk-pixbuf-devel
 BuildRequires: libglib-devel
-BuildRequires: libgphoto2-devel
 BuildRequires: libgst-plugins-base-devel
 BuildRequires: libgstreamer-devel
 BuildRequires: libgtk-devel
-BuildRequires: libilmbase-devel
-BuildRequires: libjasper-devel
 BuildRequires: libjpeg-devel
 BuildRequires: libopenexr-devel
-BuildRequires: libpango-devel
+BuildRequires: libopenjpeg-devel
 BuildRequires: libpng-devel
-BuildRequires: libpython-devel
 BuildRequires: libstdc++6-devel
 BuildRequires: libswscale-ffmpeg-devel
 BuildRequires: libtiff-devel
-BuildRequires: libunicap-devel
 BuildRequires: libwebp-devel
-BuildRequires: libxine-devel
 BuildRequires: libz-devel
+BuildRequires: python3
 ## AUTOBUILDREQ-END
-BuildRequires: python-Imaging
-BuildRequires: python-numpy
+BuildRequires: libxine-devel
+#BuildRequires: python-Imaging
+#BuildRequires: python-numpy
 Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
@@ -70,7 +64,7 @@ This package contains the OpenCV static libraries.
 Summary:       Devel package for %{name}
 Group:         Development/Libraries
 Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
-%ifnarch arm
+%ifnarch arm aarch64
 Requires:      java-opencv = %{?epoch:%epoch:}%{version}-%{release}
 %endif
 
@@ -98,20 +92,23 @@ Obsoletes:     opencv-python
 %description -n python-cv
 This package contains Python bindings for the OpenCV library.
 
-%package -n python-cv-py36
+%package -n python-cv-py3
 Summary:       Python bindings for apps which use OpenCV
 Group:         Development/Libraries
 Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
-Requires:      python-Pillow-py36
-Requires:      python-numpy-py36
+Requires:      python-Pillow-py3
+Requires:      python-numpy-py3
+Obsoletes:     python-cv-py36 <= 4.1.2-4mamba
 
-%description -n python-cv-py36
+%description -n python-cv-py3
 This package contains Python bindings for the OpenCV library.
 
 %debug_package
 
 %prep
-%setup -q -c
+#% setup -q -c -a0
+%setup -D -T
+:<< _EOF
 mv opencv-opencv-*/* .
 
 %ifarch %{ix86}
@@ -121,6 +118,10 @@ mv opencv-opencv-*/* .
 %patch4 -p1
 
 %build
+:<< _EOF
+export JAVA_HOME=%{_jvmdir}/jdk
+export JAVACMD=%{_jvmdir}/jdk/bin/java
+#:<< _EOF
 #--   Interfaces:
 # --     Use IPP:              NO   (Intel Performance Primitive)
 # --     Use TBB:              NO   (Threading Building Blocks library)
@@ -139,8 +140,8 @@ mv opencv-opencv-*/* .
  -DBUILD_SWIG_PYTHON_SUPPORT=1 \
  -DINSTALL_C_EXAMPLES=0 \
  -DCMAKE_CXX_FLAGS:STRING="$RPM_OPT_FLAGS -D__STDC_CONSTANT_MACROS" \
- -DPYTHON3_EXECUTABLE:PATH=%{__python36} \
- -DPYTHON3_PACKAGES_PATH:PATH=%{python36_sitelib} \
+ -DPYTHON3_EXECUTABLE:PATH=%{__python3} \
+ -DPYTHON3_PACKAGES_PATH:PATH=%{python3_sitelib} \
  -DOPENCV_GENERATE_PKGCONFIG=ON \
  -DOPENCV_ENABLE_NONFREE=ON \
  -DENABLE_PRECOMPILED_HEADERS=OFF \
@@ -193,7 +194,7 @@ rm -fr %{buildroot}%{_datadir}/opencv/doc
 %dir %{_datadir}/licenses/opencv4
 %{_datadir}/licenses/opencv4/*
 
-%ifnarch arm
+%ifnarch arm aarch64
 %files -n java-opencv
 %defattr(-,root,root)
 %{_datadir}/java/opencv4/libopencv_java*.so
@@ -203,14 +204,22 @@ rm -fr %{buildroot}%{_datadir}/opencv/doc
 %defattr(-,root,root)
 %dir %{python_sitelib}/cv2
 %{python_sitelib}/cv2/*
+%endif
 
-%files -n python-cv-py36
+%ifnarch arm
+%files -n python-cv-py3
 %defattr(-,root,root)
-%dir %{python36_sitelib}/cv2
-%{python36_sitelib}/cv2/*
+%dir %{python3_sitelib}/cv2
+%{python3_sitelib}/cv2/*
 %endif
 
 %changelog
+* Sat Dec 12 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.5.0-1mamba
+- update to 4.5.0
+
+* Sat Dec 12 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.1.2-5mamba
+- rebuilt with python3; updated build requirements
+
 * Sun Dec 08 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 4.1.2-4mamba
 - rebuilt with -DENABLE_PRECOMPILED_HEADERS=OFF to fix blender build, see https://stackoverflow.com/questions/43558709/opencv-and-tbb-error-x64?rq=1