1. make examples callable from root dir
2. improve error message displayed to the user when cpp is not found by
parse_file
diff --git a/examples/using_cpp_libc.py b/examples/using_cpp_libc.py
index fa9e6a7..1c28c7a 100644
--- a/examples/using_cpp_libc.py
+++ b/examples/using_cpp_libc.py
@@ -13,7 +13,7 @@
# This is not required if you've installed pycparser into
# your site-packages/ with setup.py
#
-sys.path.insert(0, '..')
+sys.path.extend(['.', '..'])
# Portable cpp path for Windows and Linux/Unix
CPPPATH = '../utils/cpp.exe' if sys.platform == 'win32' else 'cpp'