Build SQLite extension on windows

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In v.db.update there is following option:

   Name of SQLite extension file for extra functions (SQLite backend only)

For build SQLite extension for winGRASS follow these steps:

  • Install the OSGeo4W directory structure as a build environment by these instructions
  • Download extension-functions.c from here and save the file in a folder of your OSGeo4W build environment (e.g. C:\OSGeo4Wdev\src\sqliteextension)
  • Download the SQLite source from here, unzip the archive and copy sqlite3.h and sqlite3ext.h in the folder of the step before (e.g. C:\OSGeo4Wdev\src\sqliteextension)