In the file sqlite3.c (version sqlite-autoconf-3320000) we see at line 494 the code:
```
#if SQLITE_MUTEX_PTHREADS
```
and at line 503:
```
#if SQLITE_NOINLINE
```
though when these values are set through the defines at line 16509 and 13514 as:
```
# define SQLITE_MUTEX_PTHREADS
```
and
```
# define SQLITE_NOINLINE
```
this results in invalid C code.
It is suggested to replace the `#if` statements with `#ifdef` statements and remove the
```
#else
# define SQLITE_MUTEX_PTHREADS
```
Same accounts also for line 497:
```
#if SQLITE_MUTEX_W32
```
and line 485:
```
#if SQLITE_MUTEX_NOOP
```
this might also be necessary on other places where empty defines are defined.