diff --git a/check_bento_build.py b/check_bento_build.py
new file mode 100644
index 00000000..d085b3ba
--- /dev/null
+++ b/check_bento_build.py
@@ -0,0 +1,95 @@
+"""
+Check that Cython extensions in setup.py files match those in bento.info.
+"""
+import os
+import re
+
+
+RE_CYTHON = re.compile("config.add_extension\(['\"]([\S]+)['\"]")
+
+BENTO_TEMPLATE = """
+    Extension: {module_path}
+        Sources:
+            {dir_path}.pyx"""
+
+
+def each_setup_in_pkg(top_dir):
+    """Yield path and file object for each setup.py file"""
+    for dir_path, dir_names, filenames in os.walk(top_dir):
+        for fname in filenames:
+            if fname == 'setup.py':
+                with open(os.path.join(dir_path, 'setup.py')) as f:
+                    yield dir_path, f
+
+
+def each_cy_in_setup(top_dir):
+    """Yield path and name for each cython extension package's setup file."""
+    for dir_path, f in each_setup_in_pkg(top_dir):
+        text = f.read()
+        match = RE_CYTHON.findall(text)
+        if match:
+            for cy_file in match:
+                # if cython files in different directory than setup.py
+                if '.' in cy_file:
+                    parts = cy_file.split('.')
+                    cy_file = parts[-1]
+                    # Don't overwrite dir_path for subsequent iterations.
+                    path = os.path.join(dir_path, *parts[:-1])
+                else:
+                    path = dir_path
+                full_path = os.path.join(path, cy_file)
+                yield full_path, cy_file
+
+
+def each_cy_in_bento(bento_file='bento.info'):
+    """Yield path and name for each cython extension in bento info file."""
+    with open(bento_file) as f:
+        for line in f:
+            line = line.strip()
+            if line.startswith('Extension:'):
+                parts = line.split('.')
+                ext_name = parts[-1]
+                path = line.lstrip('Extension:').strip()
+                yield path, ext_name
+
+
+def remove_common_extensions(cy_bento, cy_setup):
+    for ext_name in cy_bento.keys():
+        if ext_name in cy_setup:
+            spath = cy_setup.pop(ext_name)
+            bpath = cy_bento.pop(ext_name)
+            if not spath.replace(os.path.sep, '.') == bpath:
+                print "Mismatched paths:"
+                print "    setup.py:  ", spath
+                print "    bento.info:", bpath
+
+def print_results(cy_bento, cy_setup):
+    def info(text):
+        print
+        print(text)
+        print('-' * len(text))
+
+    print # blank line; just for aesthetics
+
+    if cy_bento:
+        info("The following extensions in 'bento.info' were not found:")
+        print('\n'.join(cy_bento.keys()))
+
+
+    if cy_setup:
+        info("The following cython files exist but were not in 'bento.info':")
+        print('\n'.join(cy_setup))
+        info("Consider adding the following to the 'bento.info' Library:")
+        for ext_name, dir_path in cy_setup.iteritems():
+            print BENTO_TEMPLATE.format(module_path=dir_path.replace('/', '.'),
+                                        dir_path=dir_path)
+
+if __name__ == '__main__':
+    # All cython extensions defined in 'setup.py' files.
+    cy_setup = dict((ext, path) for path, ext in each_cy_in_setup('skimage'))
+
+    # All cython extensions defined 'bento.info' file.
+    cy_bento = dict((ext, path) for path, ext in each_cy_in_bento())
+
+    remove_common_extensions(cy_bento, cy_setup)
+    print_results(cy_bento, cy_setup)