The header for lsm_itex_to_mathml looks like this:

```
lsm_itex_to_mathml (const char *itex, int size)
```

It ends up acting as a clever wrapper to 

```
extern char * itex2MML_parse (const char * buffer, unsigned long length);
```

I think the type discrepancy between the Lasem's `int size` and itex2MML's `unsigned long length` could cause problems.  It seems like the only reason for this is to be able to pass in -1 to indicate that the function should determine the size. NULL could also work for this purpose, while still creating an unsigned long value for itex2MML.