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diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py
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index 045d24e..9b3cbf2 100644
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--- a/pycparser/c_lexer.py
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+++ b/pycparser/c_lexer.py
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@@ -9,8 +9,8 @@
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 import re
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 import sys
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-from .ply import lex
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-from .ply.lex import TOKEN
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+from ply import lex
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+from ply.lex import TOKEN
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 class CLexer(object):
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diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py
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index 744ede8..50156a3 100644
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--- a/pycparser/c_parser.py
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+++ b/pycparser/c_parser.py
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@@ -8,7 +8,7 @@
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 #------------------------------------------------------------------------------
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 import re
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-from .ply import yacc
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+from ply import yacc
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 from . import c_ast
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 from .c_lexer import CLexer
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diff --git a/setup.py b/setup.py
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index 6dce89c..b3dbfb4 100644
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--- a/setup.py
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+++ b/setup.py
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@@ -8,6 +8,8 @@ except ImportError:
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     from distutils.command.install import install as _install
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     from distutils.command.sdist import sdist as _sdist
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+import ply
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+
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 def _run_build_tables(dir):
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     from subprocess import check_call
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@@ -60,7 +62,8 @@ setup(
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         'Programming Language :: Python :: 3.6',
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     ],
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     python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
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-    packages=['pycparser', 'pycparser.ply'],
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+    packages=['pycparser'],
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+    install_requires=['ply==' + ply.__version__],
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     package_data={'pycparser': ['*.cfg']},
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     cmdclass={'install': install, 'sdist': sdist},
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 )