Dependencies:
    * graphviz-python
    * pylint
    * python-simplegeneric

If you have problems scanning big project you should apply this patch 
logilab.astng.inspector

diff --git a/inspector.py b/inspector.py
--- a/inspector.py
+++ b/inspector.py
@@ -252,11 +252,11 @@ class Linker(IdGeneratorMixIn, LocalsVis
            # analyze dependencies
            fullname = '%s.%s' % (basename, name[0])
            if fullname.find('.') > -1:
                try:
                    # XXX: don't use get_module_part, missing package precedence
-                    fullname = get_module_part(fullname)
+                    fullname = get_module_part(fullname, node.root().file)
                except ImportError:
                    continue
            if fullname != basename:
                self._imported_module(node, fullname, relative)