diff --git a/botan-1.10.17-doc-conf-2to3.patch b/botan-1.10.17-doc-conf-2to3.patch
new file mode 100644
index 0000000..e826ca6
--- /dev/null
+++ b/botan-1.10.17-doc-conf-2to3.patch
@@ -0,0 +1,38 @@
+diff -up Botan-1.10.17/doc/conf.py.orig Botan-1.10.17/doc/conf.py
+--- Botan-1.10.17/doc/conf.py.orig	2017-10-02 08:00:00.000000000 +0200
++++ Botan-1.10.17/doc/conf.py	2021-09-11 17:57:38.159934955 +0200
+@@ -40,10 +40,10 @@ version.
+ def check_sphinx_version():
+     import sphinx
+ 
+-    version = map(int, sphinx.__version__.split('.'))
++    version = list(map(int, sphinx.__version__.split('.')))
+     if version[0] == 1 and version[1] == 0 and version[2] < 7:
+         # Exit rather than throwing to avoid a confusing backtrace
+-        print "This Sphinx is too old - upgrade to at least 1.0.7"
++        print("This Sphinx is too old - upgrade to at least 1.0.7")
+         import sys
+         sys.exit(1)
+ 
+@@ -66,8 +66,8 @@ source_suffix = '.txt'
+ master_doc = 'contents'
+ 
+ # General information about the project.
+-project = u'botan'
+-copyright = u'2000-2011, Jack Lloyd'
++project = 'botan'
++copyright = '2000-2011, Jack Lloyd'
+ 
+ # The version info for the project you're documenting, acts as replacement for
+ # |version| and |release|, also used in various other places throughout the
+@@ -214,8 +214,8 @@ htmlhelp_basename = 'botandoc'
+ # Grouping the document tree into LaTeX files. List of tuples
+ # (source start file, target name, title, author, documentclass [howto/manual]).
+ latex_documents = [
+-  ('contents', 'botan.tex', u'botan Reference Manual',
+-   u'Jack Lloyd', 'manual'),
++  ('contents', 'botan.tex', 'botan Reference Manual',
++   'Jack Lloyd', 'manual'),
+ ]
+ 
+ # The name of an image file (relative to this directory) to place at the top of
diff --git a/botan.spec b/botan.spec
index 55b7d48..62576bc 100644
--- a/botan.spec
+++ b/botan.spec
@@ -2,7 +2,7 @@
 
 Name:           botan
 Version:        %{major_version}.17
-Release:        27%{?dist}
+Release:        28%{?dist}
 Summary:        Crypto library written in C++
 
 License:        BSD
@@ -17,6 +17,8 @@ Patch0:         botan-1.10.5-ecc-fix.patch
 Patch1:         botan-boost_python.patch
 # Fix wrong path
 Patch2:         botan-1.10.13-python-init.patch
+# 2to3 doc/conf.py
+Patch3:         botan-1.10.17-doc-conf-2to3.patch
 
 BuildRequires:  gcc-c++
 BuildRequires:  python3
@@ -25,7 +27,7 @@ BuildRequires:  python3-sphinx
 BuildRequires:  boost-python3-devel
 BuildRequires:  bzip2-devel
 BuildRequires:  zlib-devel
-BuildRequires: make
+BuildRequires:  make
 
 # do not check .so files in the python_sitelib directories
 %global __provides_exclude_from ^(%{python3_sitearch}/.*\\.so)$
@@ -78,9 +80,7 @@ interfaces may change in the future.
 
 %prep
 %setup -q -n Botan-%{version}
-%patch0 -p1 -b .eccfix
-%patch1 -p1
-%patch2 -p1
+%autosetup -p1 -n Botan-%{version}
 
 # These tests will fail.
 rm -rf checks/ec_tests.cpp
@@ -193,6 +193,9 @@ LD_LIBRARY_PATH=%{buildroot}%{_libdir} ./check --validate
 
 
 %changelog
+* Sat Sep 11 2021 Thomas Moschny <thomas.moschny@gmx.de> - 1.10.17-28
+- Fix FTBFS on F35 and later.
+
 * Fri Aug 06 2021 Jonathan Wakely <jwakely@redhat.com> - 1.10.17-27
 - Rebuilt for Boost 1.76