diff --git a/Lib/ctypes/macholib/dyld.py b/Lib/ctypes/macholib/dyld.py
new file mode 100644
index 0000000..a336fd0
--- /dev/null
+++ b/Lib/ctypes/macholib/dyld.py
@@ -0,0 +1,166 @@
+"""
+dyld emulation
+"""
+
+import os
+from framework import framework_info
+from dylib import dylib_info
+from itertools import *
+
+__all__ = [
+    'dyld_find', 'framework_find',
+    'framework_info', 'dylib_info',
+]
+
+# These are the defaults as per man dyld(1)
+#
+DEFAULT_FRAMEWORK_FALLBACK = [
+    os.path.expanduser("~/Library/Frameworks"),
+    "/Library/Frameworks",
+    "/Network/Library/Frameworks",
+    "/System/Library/Frameworks",
+]
+
+DEFAULT_LIBRARY_FALLBACK = [
+    os.path.expanduser("~/lib"),
+    "/usr/local/lib",
+    "/lib",
+    "/usr/lib",
+]
+
+def ensure_utf8(s):
+    """Not all of PyObjC and Python understand unicode paths very well yet"""
+    if isinstance(s, unicode):
+        return s.encode('utf8')
+    return s
+
+def dyld_env(env, var):
+    if env is None:
+        env = os.environ
+    rval = env.get(var)
+    if rval is None:
+        return []
+    return rval.split(':')
+
+def dyld_image_suffix(env=None):
+    if env is None:
+        env = os.environ
+    return env.get('DYLD_IMAGE_SUFFIX')
+
+def dyld_framework_path(env=None):
+    return dyld_env(env, 'DYLD_FRAMEWORK_PATH')
+
+def dyld_library_path(env=None):
+    return dyld_env(env, 'DYLD_LIBRARY_PATH')
+
+def dyld_fallback_framework_path(env=None):
+    return dyld_env(env, 'DYLD_FALLBACK_FRAMEWORK_PATH')
+
+def dyld_fallback_library_path(env=None):
+    return dyld_env(env, 'DYLD_FALLBACK_LIBRARY_PATH')
+
+def dyld_image_suffix_search(iterator, env=None):
+    """For a potential path iterator, add DYLD_IMAGE_SUFFIX semantics"""
+    suffix = dyld_image_suffix(env)
+    if suffix is None:
+        return iterator
+    def _inject(iterator=iterator, suffix=suffix):
+        for path in iterator:
+            if path.endswith('.dylib'):
+                yield path[:-len('.dylib')] + suffix + '.dylib'
+            else:
+                yield path + suffix
+            yield path
+    return _inject()
+
+def dyld_override_search(name, env=None):
+    # If DYLD_FRAMEWORK_PATH is set and this dylib_name is a
+    # framework name, use the first file that exists in the framework
+    # path if any.  If there is none go on to search the DYLD_LIBRARY_PATH
+    # if any.
+
+    framework = framework_info(name)
+
+    if framework is not None:
+        for path in dyld_framework_path(env):
+            yield os.path.join(path, framework['name'])
+
+    # If DYLD_LIBRARY_PATH is set then use the first file that exists
+    # in the path.  If none use the original name.
+    for path in dyld_library_path(env):
+        yield os.path.join(path, os.path.basename(name))
+
+def dyld_executable_path_search(name, executable_path=None):
+    # If we haven't done any searching and found a library and the
+    # dylib_name starts with "@executable_path/" then construct the
+    # library name.
+    if name.startswith('@executable_path/') and executable_path is not None:
+        yield os.path.join(executable_path, name[len('@executable_path/'):])
+
+def dyld_default_search(name, env=None):
+    yield name
+
+    framework = framework_info(name)
+
+    if framework is not None:
+        fallback_framework_path = dyld_fallback_framework_path(env)
+        for path in fallback_framework_path:
+            yield os.path.join(path, framework['name'])
+
+    fallback_library_path = dyld_fallback_library_path(env)
+    for path in fallback_library_path:
+        yield os.path.join(path, os.path.basename(name))
+
+    if framework is not None and not fallback_framework_path:
+        for path in DEFAULT_FRAMEWORK_FALLBACK:
+            yield os.path.join(path, framework['name'])
+
+    if not fallback_library_path:
+        for path in DEFAULT_LIBRARY_FALLBACK:
+            yield os.path.join(path, os.path.basename(name))
+
+def dyld_find(name, executable_path=None, env=None):
+    """
+    Find a library or framework using dyld semantics
+    """
+    name = ensure_utf8(name)
+    executable_path = ensure_utf8(executable_path)
+    for path in dyld_image_suffix_search(chain(
+                dyld_override_search(name, env),
+                dyld_executable_path_search(name, executable_path),
+                dyld_default_search(name, env),
+            ), env):
+        if os.path.isfile(path):
+            return path
+    raise ValueError, "dylib %s could not be found" % (name,)
+
+def framework_find(fn, executable_path=None, env=None):
+    """
+    Find a framework using dyld semantics in a very loose manner.
+
+    Will take input such as:
+        Python
+        Python.framework
+        Python.framework/Versions/Current
+    """
+    try:
+        return dyld_find(fn, executable_path=executable_path, env=env)
+    except ValueError, e:
+        pass
+    fmwk_index = fn.rfind('.framework')
+    if fmwk_index == -1:
+        fmwk_index = len(fn)
+        fn += '.framework'
+    fn = os.path.join(fn, os.path.basename(fn[:fmwk_index]))
+    try:
+        return dyld_find(fn, executable_path=executable_path, env=env)
+    except ValueError:
+        raise e
+
+def test_dyld_find():
+    env = {}
+    assert dyld_find('libSystem.dylib') == '/usr/lib/libSystem.dylib'
+    assert dyld_find('System.framework/System') == '/System/Library/Frameworks/System.framework/System'
+
+if __name__ == '__main__':
+    test_dyld_find()