Add missing header to setup.py

CMakeLists.txt

@@ -34,6 +34,7 @@ set(PYTHON_LIBRARIES ${PYTHON_LIBRARIES} CACHE INTERNAL "")
 set(PYTHON_MODULE_PREFIX ${PYTHON_MODULE_PREFIX} CACHE INTERNAL "")
 set(PYTHON_MODULE_EXTENSION ${PYTHON_MODULE_EXTENSION} CACHE INTERNAL "")
 
+# NB: when adding a header don't forget to also add it to setup.py
 set(PYBIND11_HEADERS
   include/pybind11/attr.h
   include/pybind11/buffer_info.h

setup.py

@@ -13,6 +13,7 @@ if os.environ.get('PYBIND11_USE_CMAKE'):
 else:
     headers = [
         'include/pybind11/attr.h',
+        'include/pybind11/buffer_info.h',
         'include/pybind11/cast.h',
         'include/pybind11/chrono.h',
         'include/pybind11/class_support.h',