I tried compiling 1.3.0 --with-pspell I can now spellcheck multilingual documents - great!
Unfortunately, the spellcheck always crashes lyx when it hits the end of text. Lyx complains about catching a sigsegv and successfully does an emergency save. I can avoid this by butting a nonword at the end of the document and cancle the spellcheck when it reaches that. Helge Hafting