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diff --git a/pycparser/_build_tables.py b/pycparser/_build_tables.py
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+++ b/pycparser/_build_tables.py
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+#-----------------------------------------------------------------
+# pycparser: _build_tables.py
+#
+# A dummy for generating the lexing/parsing tables and and
+# compiling them into .pyc for faster execution in optimized mode.
+# Also generates AST code from the configuration file.
+# Should be called from the pycparser directory.
+#
+# Eli Bendersky [https://eli.thegreenplace.net/]
+# License: BSD
+#-----------------------------------------------------------------
+
+# Insert '.' and '..' as first entries to the search path for modules.
+# Restricted environments like embeddable python do not include the
+# current working directory on startup.
+import importlib
+import sys
+sys.path[0:0] = ['.', '..']
+
+# Generate c_ast.py
+from _ast_gen import ASTCodeGenerator
+ast_gen = ASTCodeGenerator('_c_ast.cfg')
+ast_gen.generate(open('c_ast.py', 'w'))
+
+from pycparser import c_parser
+
+# Generates the tables
+#
+c_parser.CParser(
+    lex_optimize=True,
+    yacc_debug=False,
+    yacc_optimize=True)
+
+# Load to compile into .pyc
+#
+importlib.invalidate_caches()
+
+import lextab
+import yacctab
+import c_ast