google-perftools : Fast, mutli-threaded malloc() and nifty performance analysis tools ( http://code.google.com/p/google-perftools/ )
xmlrpc-epi : An implementation of the xmlrpc protocol in C ( http://xmlrpc-epi.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a matsuu
For Paludis use this rsync : rsync://gentoo.zugaina.org/matsuu-portage
If you have a problem : ycarus(-at-)zugaina.org