Help with configure option

[Alistair Leslie-Hughes]

Hi,
   I need to add an option, HAS_TEXTCONCAT_BUG to the configure script 
to check for a bug in libxml.  What file(s) do I have to change?

The file attached is an example to test for this issue. (returns -1 if 
the error exists)

Best Regards
  Alistair Leslie-Hughes