Hi, I tried your patch, which seemed to work very well at first -- my
normal emacs fonts were indeed anti-aliased, and looked very nice.  The
patch seems impressively small.

I had to use the following extra patch to get things to compile on my
system (Debian unstable), apparently due to bogosities in <png.h>.
I'm not sure why your change tickled it; maybe due to including <Xft.h>
in dispextern.h.