EXTRA_SIZE       1576 ext/pdo_sqlite/sqlite/src/btree.c   rc = sqlite3PagerOpen(&pBt->pPager, zFilename, EXTRA_SIZE, flags);
EXTRA_SIZE        711 ext/sqlite/libsqlite/src/btree.c   rc = sqlitepager_open(&pBt->pPager, zFilename, nCache, EXTRA_SIZE,