[xml] problem compiling libxml++-0.13 with libxml2-2.2.12

[John Hunter <jdhunter ace bsd uchicago edu>]

I just installed libxml2-2.2.12 on an RHL 7.1 system.  I then tried to
install libxml++-0.13 but the make failed with the error

g++ -DPACKAGE=\"libxml++\" -DVERSION=\"0.13\" -DHAVE_STRING=1 -DHAVE_LIST=1 -DHAVE_HASH_MAP=1 -I. -I. 
-I/usr/local/include/libxml -I/usr/local/include -g -O2 -c xml++.cc  -fPIC -DPIC -o .libs/xml++.lo
xml++.cc: In method `bool XMLTree::write () const':
xml++.cc:91: `xmlSaveFormatFile' undeclared (first use this function)

The libxml++ configure recognized the libxml2 version with the line:
  
  checking for libxml version >= 2.0.0... yes

I cannot find any references to xmlSaveFormatFile in the
libxml2-2.2.12 src tree, nor in any of the other files in the
xmlSaveFormatFile tree.  Should this function call be replaced with
another?

Thanks,
John Hunter