add to "sqlite3.c":

at the beginning:

// ESENTHEL
#ifdef __APPLE__
   #include "TargetConditionals.h"
   #if TARGET_IPHONE_SIMULATOR
      #define SQLITE_HOMEGROWN_RECURSIVE_MUTEX 1
   #endif
#elif defined EMSCRIPTEN
   #define SQLITE_MAX_WORKER_THREADS 0
#endif


at the end:

// ESENTHEL

void SQLiteMutexEnter(sqlite3 *db) {sqlite3_mutex_enter(db->mutex);}
void SQLiteMutexLeave(sqlite3 *db) {sqlite3_mutex_leave(db->mutex);}

add to "sqlite3.h":

// ESENTHEL

extern "C"
{
   void SQLiteMutexEnter(sqlite3 *db);
   void SQLiteMutexLeave(sqlite3 *db);
}