diff --git a/.gitignore b/.gitignore
index fd4950b..3b31a6b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,3 @@
 /release_v2.14.tar.gz
 /release_v2.19.tar.gz
 /release_v2.20.tar.gz
-/release_v2.22.tar.gz
diff --git a/pycparser-unbundle-ply.patch b/pycparser-unbundle-ply.patch
index 5abbf72..0f0cd6b 100644
--- a/pycparser-unbundle-ply.patch
+++ b/pycparser-unbundle-ply.patch
@@ -1,10 +1,10 @@
 diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py
-index 22c64bc..a97c5d1 100644
+index 045d24e..9b3cbf2 100644
 --- a/pycparser/c_lexer.py
 +++ b/pycparser/c_lexer.py
-@@ -8,8 +8,8 @@
- #------------------------------------------------------------------------------
+@@ -9,8 +9,8 @@
  import re
+ import sys
  
 -from .ply import lex
 -from .ply.lex import TOKEN
@@ -14,20 +14,20 @@ index 22c64bc..a97c5d1 100644
  
  class CLexer(object):
 diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py
-index d31574a..5fc3544 100644
+index 744ede8..50156a3 100644
 --- a/pycparser/c_parser.py
 +++ b/pycparser/c_parser.py
-@@ -6,7 +6,7 @@
- # Eli Bendersky [https://eli.thegreenplace.net/]
- # License: BSD
+@@ -8,7 +8,7 @@
  #------------------------------------------------------------------------------
+ import re
+ 
 -from .ply import yacc
 +from ply import yacc
  
  from . import c_ast
  from .c_lexer import CLexer
 diff --git a/setup.py b/setup.py
-index f7e89bf..f78f559 100644
+index 6dce89c..b3dbfb4 100644
 --- a/setup.py
 +++ b/setup.py
 @@ -8,6 +8,8 @@ except ImportError:
@@ -40,9 +40,9 @@ index f7e89bf..f78f559 100644
  def _run_build_tables(dir):
      from subprocess import check_call
 @@ -60,7 +62,8 @@ setup(
-         'Programming Language :: Python :: 3.12',
+         'Programming Language :: Python :: 3.6',
      ],
-     python_requires=">=3.8",
+     python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
 -    packages=['pycparser', 'pycparser.ply'],
 +    packages=['pycparser'],
 +    install_requires=['ply==' + ply.__version__],
diff --git a/python-pycparser.spec b/python-pycparser.spec
index aa370d5..09b55f8 100644
--- a/python-pycparser.spec
+++ b/python-pycparser.spec
@@ -2,7 +2,7 @@
 
 Name:           python-pycparser
 Summary:        C parser and AST generator written in Python
-Version:        2.22
+Version:        2.20
 Release:        %autorelease
 License:        BSD-3-Clause
 URL:            http://github.com/eliben/pycparser
@@ -19,11 +19,12 @@ Patch100:       pycparser-unbundle-ply.patch
 BuildArch:      noarch
 
 BuildRequires:  python3-devel
+BuildRequires:  python3-setuptools
 BuildRequires:  python3-ply
 
 # for unit tests
 %if %{with tests}
-BuildRequires:  gcc
+BuildRequires:  cpp
 %endif
 
 %description
@@ -33,6 +34,7 @@ need to parse C source code.
 
 %package -n python3-pycparser
 Summary:        %{summary}
+%{?python_provide:%python_provide python3-pycparser}
 
 %description -n python3-pycparser
 pycparser is a complete parser for the C language, written in pure Python.
@@ -48,27 +50,25 @@ rm -r pycparser/ply
 # Remove relative sys.path from the examples
 %{python3} %{SOURCE1} examples
 
-%generate_buildrequires
-%pyproject_buildrequires
-
 %build
-pushd pycparser
+%py3_build
+pushd build/lib/pycparser
 %{python3} _build_tables.py
 popd
-%pyproject_wheel
 
 %install
-%pyproject_install
-%pyproject_save_files -l pycparser
+%py3_install
 
 %check
-%pyproject_check_import
 %if %{with tests}
-%py3_test_envvars %{python3} -m unittest discover
+%{python3} tests/all_tests.py
 %endif
  
-%files -n python3-pycparser -f %{pyproject_files}
+%files -n python3-pycparser
+%license LICENSE
 %doc examples
+%{python3_sitelib}/pycparser/
+%{python3_sitelib}/pycparser-*.egg-info/
 
 %changelog
 %autochangelog
diff --git a/sources b/sources
index 14d685c..4789666 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (release_v2.22.tar.gz) = 1c5be2b83c0a892cafa55a2595942d7048994772dc0fc71d2943004b4198d939c0bf2a164d763d94fe11d532e49371c59c1cf4037c32dab8d3cf0c553a8de64a
+SHA512 (release_v2.20.tar.gz) = d2dc48727750ec0a80d5e3b0c9fba390c3647416a3e18cad59429edb9f55d043c7695c52301b037c93af5d96ffc85fcba7cd54d376abdb89e973759c59fa189d