> As usual, the code in gettemp.c looks fine...
Does it?

> 
>         /* Move to end of path and count trailing X's. */
>         for (trv = path; *trv; ++trv) */   
>                 if (*trv == 'X')
>                         xcnt++;
>                 else    
>                         xcnt = 0;
> 
>         /* Use at least one from xtra.  Use 2 if more than 6 X's. */
>         if (*(trv-1) == 'X')
Maybe I've not had enough coffee, but isn't code in gettemp.c
missing a lot of tests?  The trv pointer should never point
before path, but it can.  Imagine path being "", then trv
will point at the NUL byte, and *(trv-1) will access the byte
before the passed argument.

I don't know if this is the cause of your problem, but it
sure looks buggy to me.

     -- Lennart