I randomly checked the compression.ru forum, and found something
useful there: http://forum.compression.ru/viewtopic.php?f=2&t=3027
http://nishi.dreamhosters.com/u/lzma.rar
The first actually portable lzma source I've ever seen on the net.
Looks like somebody made this from lzma library, but it looks fairly neat,
without noticeable style differences, so maybe Igor himself posted it
somewhere and somehow.