Why are with-mp3lame and enable-speechd conflicting?

[oldherl]

From INSTALL:

--with-mp3lame=yes     Enable MP3 export function. This option is conflict to --enable-speechd.

Why are they conflicting with each other? Can I enable both?

[hgneng]

I can't remember why. But why do you need "--enable-speechd" option? It's mainly for Orca screen reader.