initial starting point for fix

Cython/Utils.py

@@ -168,6 +168,13 @@ def search_include_directories(dirs, qualified_name, suffix, pos,
                                     package_filename)
                 if path_exists(path):
                     return path
+                inits = {"__init__.py", "__init__.pyx", "__init__.pxd"} - {package_filename}
+                paths = [os.path.join(dir, package_dir, module_name,
+                                    init_filename) for init_filename in inits] 
+                if any(path_exists(p) for p in paths):
+                    path = os.path.join(dir, package_dir, module_name, 'sub.pxd')
+                    if path_exists(path):
+                        return path
     return None
 
 

tests/run/cimport.srctree

@@ -33,6 +33,12 @@ cdef int foo(int a):
 
 ctypedef int my_int
 
+######## pkg/subpkg/__init__.py ########
+
+######## pkg/subpkg/submod.pxd ########
+
+ctypedef int my_int
+
 ######## a.pyx ########
 
 from other cimport A, foo
@@ -43,3 +49,5 @@ print other.A, other.foo(10)
 
 from pkg cimport sub
 cdef sub.my_int a = 100
+
+from pkg.subpkg cimport submod
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