Add Python 3 rpm subpackage

Allow compilation and packaging of both python2 and python3
when present

libxml.spec.in

+%global with_python3 1
+
 Summary: Library providing XML and HTML support
 Name: libxml2
 Version: @VERSION@
@@ -6,7 +8,13 @@ License: MIT
 Group: Development/Libraries
 Source: ftp://xmlsoft.org/libxml2/libxml2-%{version}.tar.gz
 BuildRoot: %{_tmppath}/%{name}-%{version}-root
-BuildRequires: python python-devel zlib-devel pkgconfig xz-devel
+BuildRequires: python-devel
+%if 0%{?with_python3}
+BuildRequires: python3-devel
+%endif # with_python3
+BuildRequires: zlib-devel
+BuildRequires: pkgconfig
+BuildRequires: xz-devel
 URL: http://xmlsoft.org/
 
 %description
@@ -55,8 +63,8 @@ Group: Development/Libraries
 Requires: libxml2 = %{version}-%{release}
 
 %description python
-The libxml2-python package contains a module that permits applications
-written in the Python programming language to use the interface
+The libxml2-python package contains a Python 2 module that permits applications
+written in the Python programming language, version 2, to use the interface
 supplied by the libxml2 library to manipulate XML files.
 
 This library allows to manipulate XML files. It includes support
@@ -64,6 +72,23 @@ to read, modify and write XML and HTML files. There is DTDs support
 this includes parsing and validation even with complex DTDs, either
 at parse time or later once the document has been modified.
 
+%if 0%{?with_python3}
+%package python3
+Summary: Python 3 bindings for the libxml2 library
+Group: Development/Libraries
+Requires: libxml2 = %{version}-%{release}
+
+%description python3
+The libxml2-python3 package contains a Python 3 module that permits
+applications written in the Python programming language, version 3, to use the
+interface supplied by the libxml2 library to manipulate XML files.
+
+This library allows to manipulate XML files. It includes support
+to read, modify and write XML and HTML files. There is DTDs support
+this includes parsing and validation even with complex DTDs, either
+at parse time or later once the document has been modified.
+%endif # with_python3
+
 %prep
 %setup -q
 
@@ -76,6 +101,13 @@ rm -fr %{buildroot}
 
 make install DESTDIR=%{buildroot}
 
+%if 0%{?with_python3}
+make clean
+%configure --with-python=%{__python3}
+make install DESTDIR=%{buildroot}
+%endif # with_python3
+
+
 rm -f $RPM_BUILD_ROOT%{_libdir}/*.la
 rm -f $RPM_BUILD_ROOT%{_libdir}/python*/site-packages/*.a
 rm -f $RPM_BUILD_ROOT%{_libdir}/python*/site-packages/*.la
@@ -136,14 +168,30 @@ rm -fr %{buildroot}
 %files python
 %defattr(-, root, root)
 
-%{_libdir}/python*/site-packages/libxml2.py*
-%{_libdir}/python*/site-packages/drv_libxml2.py*
-%{_libdir}/python*/site-packages/libxml2mod*
+%{_libdir}/python2*/site-packages/libxml2.py*
+%{_libdir}/python2*/site-packages/drv_libxml2.py*
+%{_libdir}/python2*/site-packages/libxml2mod*
+%doc python/TODO
+%doc python/libxml2class.txt
+%doc python/tests/*.py
+%doc doc/*.py
+%doc doc/python.html
+
+%if 0%{?with_python3}
+%files python3
+%defattr(-, root, root)
+
+%{_libdir}/python3*/site-packages/libxml2.py*
+%{_libdir}/python3*/site-packages/drv_libxml2.py*
+%{_libdir}/python3*/site-packages/__pycache__/libxml2.cpython-34.py*
+%{_libdir}/python3*/site-packages/__pycache__/drv_libxml2.cpython-34.py*
+%{_libdir}/python3*/site-packages/libxml2mod*
 %doc python/TODO
 %doc python/libxml2class.txt
 %doc python/tests/*.py
 %doc doc/*.py
 %doc doc/python.html
+%endif # with_python3
 
 %changelog
 * @RELDATE@ Daniel Veillard <veillard@redhat.com>