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Installing qspatialit in QGis master terminat with fault:
The plugin depends on some components missing on your system. You need to install following python module in order to enable it: _qspatialite

Starting QGgis, popup window reports:

Konnte Erweiterung QspatiaLite nicht laden wegen eines Fehler beim Aufruf seiner classFactory()-Methode

Traceback (most recent call last):
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 164, in startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "C:/Dokumente und Einstellungen/gerhard/.qgis//python/plugins\\QspatiaLite\\__init__.py", line 34, in classFactory
    from qspatialite import QspatiaLite
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 360, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/Dokumente und Einstellungen/gerhard/.qgis//python/plugins\\QspatiaLite\\qspatialite.py", line 29, in 
    from QspatiaLiteApp import QspatiaLiteApp
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 360, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/Dokumente und Einstellungen/gerhard/.qgis//python/plugins\\QspatiaLite\\QspatiaLiteApp.py", line 27, in 
    from Classes.Database import *
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 360, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/Dokumente und Einstellungen/gerhard/.qgis//python/plugins\\QspatiaLite\\Classes\\Database.py", line 1, in 
    from pyspatialite import dbapi2 as sqlite #Load PySpatiaLite
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 360, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/OSGeo4W/apps/qgis-dev/./python\\pyspatialite\\dbapi2.py", line 27, in 
  File "C:/OSGeo4W/apps/qgis-dev/./python\\qgis\\utils.py", line 360, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named _spatialite

Python-Version:
2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]

QGIS-Version:
1.9.0-Master Master, e4793d6

Python-Pfad: ['C:/OSGeo4W/apps/qgis-dev/./python', 'C:/Dokumente und Einstellungen/gerhard/.qgis//python', 'C:/Dokumente und Einstellungen/gerhard/.qgis//python/plugins', 'C:/OSGeo4W/apps/qgis-dev/./python/plugins', 'C:\\\\OSGeo4W\\\\bin\\\\python27.zip', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\DLLs', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\plat-win', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\lib-tk', 'C:\\\\OSGeo4W\\\\bin', 'C:\\\\OSGeo4W\\\\apps\\\\Python27', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\PIL', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\win32', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\win32\\\\lib', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\Pythonwin', 'C:\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\wx-2.8-msw-unicode', 'C:\\\\Dokumente und Einstellungen\\\\gerhard\\\\.qgis\\\\python\\\\plugins\\\\mmqgis/forms', '/usr/share/qgis/python']