Hello August,
well, yes, I downloaded and compiled the lastest version available on your site. I saw that you included a ReadFlac.cpp.seekable file but If i try to compile it I get errors.
Vincent,
in the dirctory "readanysf~0.13/include" is another file called ReadFlac.h.seekable. mv this to ReadFlac.h and compile again.
that should compile ok. and, you will be able to seek on flac files. just, when you seek too much, or to certain points in the file, it will simply bail on you. (but, maybe this has been fixed in the new flac release, dunno)
best -august.