diff --git a/calibre.spec b/calibre.spec
index 6e46d4e..6ee1101 100644
--- a/calibre.spec
+++ b/calibre.spec
@@ -1,6 +1,6 @@
 Name:          calibre
 Version:       4.13.0
-Release:       1mamba
+Release:       3mamba
 Summary:       A free and open source e-book library management application
 Group:         Graphical Desktop/Applications/Multimedia
 Vendor:        openmamba
@@ -28,64 +28,64 @@ BuildRequires: libicu-devel
 BuildRequires: libmtp-devel
 BuildRequires: libopenssl-devel
 BuildRequires: libpodofo-devel
-BuildRequires: libpython-devel
-BuildRequires: libpython27-devel
+BuildRequires: libpython3-devel
 BuildRequires: libqt5-devel
 BuildRequires: libstdc++6-devel
 BuildRequires: libusb-devel
 BuildRequires: libz-devel
 ## AUTOBUILDREQ-END
-BuildRequires: BeautifulSoup
-BuildRequires: dnspython
-BuildRequires: libwmf
-BuildRequires: python-mechanize
-BuildRequires: python-cssutils
-BuildRequires: python-lxml
-BuildRequires: libpython-devel
-BuildRequires: python-sip-devel
-BuildRequires: python-ordereddict
-BuildRequires: python-cssselect
-BuildRequires: libmtp-devel
-BuildRequires: python-dateutil
+BuildRequires: libpython3-devel
 BuildRequires: libpodofo-devel >= 0.9.3
-BuildRequires: python-dukpy
-BuildRequires: python-html5-parser
-BuildRequires: pyicu
+BuildRequires: libwmf-devel
+#BuildRequires: BeautifulSoup
+#BuildRequires: dnspython
+BuildRequires: python-apsw-py3
+BuildRequires: python-beautifulsoup4-py3
+#BuildRequires: python-cssutils
+BuildRequires: python-cssselect-py3
+BuildRequires: python-css-parser-py3
+BuildRequires: python-dateutil-py3
+#BuildRequires: python-dukpy
+BuildRequires: python-feedparser-py3
+BuildRequires: python-html5lib-py3
+BuildRequires: python-html5-parser-py3
+BuildRequires: python-lxml-py3
+BuildRequires: python-mechanize-py3
+BuildRequires: python-msgpack-py3
+BuildRequires: python-ordereddict
+BuildRequires: python-regex-py3
+BuildRequires: python-sip-py3
+BuildRequires: python-six-py3
+BuildRequires: python-soupsieve-py3
+BuildRequires: python-webencodings-py3
+#BuildRequires: pyicu
 BuildRequires: PyQt5-devel
-BuildRequires: pyqtwebengine
-BuildRequires: python-webencodings
-BuildRequires: python-regex
-BuildRequires: python-msgpack
-BuildRequires: python-feedparser
-BuildRequires: python-css-parser
-BuildRequires: python-beautifulsoup4
-BuildRequires: python-apsw
-BuildRequires: python-soupsieve
-Requires:      PyQt5 >= 5.13.0
-Requires:      pyqtwebengine >= 5.13.0
-Requires:      python-lxml
-Requires:	   python-six
-Requires:      python-apsw
-Requires:      cssutils
-Requires:      mechanize
-Requires:      python27 >= %python27_version
-Requires:      python-cssselect
-Requires:      python-dateutil
-Requires:      BeautifulSoup
-Requires:      python-netifaces
-Requires:      pyicu
-Requires:      python-dukpy
-Requires:      python-html5-parser
-Requires:      python-webencodings
-Requires:      python-regex
-Requires:      python-chardet
-Requires:      python-html5lib
-Requires:      python-msgpack
-Requires:      python-feedparser
-Requires:      python-css-parser
-Requires:      python-beautifulsoup4
-Requires:      python-apsw
-Requires:      python-soupsieve
+BuildRequires: PyQt5-py3
+BuildRequires: pyqtwebengine-py3
+Requires:      PyQt5-py3 >= 5.13.0
+Requires:      pyqtwebengine-py3 >= 5.13.0
+Requires:      python3 >= %python3_version
+#Requires:      BeautifulSoup
+#Requires:      pyicu
+Requires:      python-apsw-py3
+Requires:      python-beautifulsoup4-py3
+#Requires:      python-chardet
+Requires:      python-cssselect-py3
+#Requires:      python-cssutils-py3
+Requires:      python-css-parser-py3
+Requires:      python-dateutil-py3
+#Requires:      python-dukpy
+Requires:      python-feedparser-py3
+Requires:      python-html5lib-py3
+Requires:      python-html5-parser-py3
+Requires:      python-lxml-py3
+Requires:      python-mechanize-py3
+Requires:      python-msgpack-py3
+Requires:      python-netifaces-py3
+Requires:      python-regex-py3
+Requires:	   python-six-py3
+Requires:      python-soupsieve-py3
+Requires:      python-webencodings-py3
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
@@ -101,22 +101,17 @@ calibre is a free and open source e-book library management application develope
 export QTWEBENGINE_DISABLE_SANDBOX=1
 %endif
 
-CFLAGS="%{optflags}" %{__python27} setup.py bootstrap
-CFLAGS="%{optflags}" %{__python27} setup.py build
-CFLAGS="%{optflags}" %{__python27} setup.py resources
+CALIBRE_PY3_PORT=1 CFLAGS="%{optflags}" %{__python3} setup.py bootstrap
+CALIBRE_PY3_PORT=1 CFLAGS="%{optflags}" %{__python3} setup.py build
+CALIBRE_PY3_PORT=1 CFLAGS="%{optflags}" %{__python3} setup.py resources
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%{__python27} setup.py install \
+CALIBRE_PY3_PORT=1 %{__python3} setup.py install \
    --root=%{buildroot}/usr  \
    --staging-libdir=%{buildroot}%{_libdir} \
    --libdir=%{_libdir}
 
-#mkdir %{buildroot}%{_datadir}/applications
-#cp %SOURCE1 %{buildroot}%{_datadir}/applications/calibre.desktop
-#install -D -m0644 %{buildroot}%{_datadir}/calibre/content-server/calibre.png \
-#   %{buildroot}%{_datadir}/pixmaps/calibre.png
-
 %files 
 %defattr(-,root,root)
 %{_bindir}/calibre
@@ -134,9 +129,9 @@ CFLAGS="%{optflags}" %{__python27} setup.py resources
 %{_datadir}/mime/packages/calibre-mimetypes.xml
 %{_datadir}/bash-completion/completions/*
 %dir %{_libdir}/calibre
-%dir %{_libdir}/calibre/calibre
 %dir %{_libdir}/calibre/backports
 %{_libdir}/calibre/backports/*
+%dir %{_libdir}/calibre/calibre
 %{_libdir}/calibre/calibre/*.py
 %dir %{_libdir}/calibre/calibre/db
 %{_libdir}/calibre/calibre/db/*
@@ -150,10 +145,17 @@ CFLAGS="%{optflags}" %{__python27} setup.py resources
 %{_libdir}/calibre/calibre/gui2/*
 %dir %{_libdir}/calibre/calibre/library
 %{_libdir}/calibre/calibre/library/*
+%dir %{_libdir}/calibre/calibre/plugins
+%dir %{_libdir}/calibre/calibre/plugins/3
+%{_libdir}/calibre/calibre/plugins/3/*
+%dir %{_libdir}/calibre/calibre/srv
+%{_libdir}/calibre/calibre/srv/*.py
+%dir %{_libdir}/calibre/calibre/srv/tests
+%{_libdir}/calibre/calibre/srv/tests/*.py
 %dir %{_libdir}/calibre/calibre_lzma
 %{_libdir}/calibre/calibre_lzma/*
 %dir %{_libdir}/calibre/calibre/plugins
-%{_libdir}/calibre/calibre/plugins/*.so
+#%{_libdir}/calibre/calibre/plugins/*.so
 %dir %{_libdir}/calibre/calibre/spell
 %{_libdir}/calibre/calibre/spell/*.py
 %dir %{_libdir}/calibre/calibre/translations
@@ -170,10 +172,6 @@ CFLAGS="%{optflags}" %{__python27} setup.py resources
 %{_libdir}/calibre/odf/*.py
 %dir %{_libdir}/calibre/polyglot
 %{_libdir}/calibre/polyglot/*
-%dir %{_libdir}/calibre/calibre/srv
-%{_libdir}/calibre/calibre/srv/*.py
-%dir %{_libdir}/calibre/calibre/srv/tests
-%{_libdir}/calibre/calibre/srv/tests/*.py
 %dir %{_libdir}/calibre/templite
 %{_libdir}/calibre/templite/*.py
 %dir %{_libdir}/calibre/tinycss/
@@ -186,9 +184,15 @@ CFLAGS="%{optflags}" %{__python27} setup.py resources
 %{_datadir}/icons/hicolor/*/mimetypes/application-*.png
 %{_datadir}/icons/hicolor/*/mimetypes/gnome-mime-*.png
 %{_datadir}/icons/hicolor/*/mimetypes/text-lrs.png
-%{python27_sitelib}/init_calibre.py
+%{python3_sitelib}/init_calibre.py
 
 %changelog
+* Mon Apr 13 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.13.0-3mamba
+- fix python3 build
+
+* Sat Apr 11 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.13.0-2mamba
+- python3 rebuild
+
 * Mon Mar 30 2020 Automatic Build System <autodist@mambasoft.it> 4.13.0-1mamba
 - automatic version update by autodist