I've now done sox-13.0.0 and uploaded it. I'm a bit stuck on vorbis-tools and ffmeg2theora.
With vorbis-tools I get many pthread errors during make, such as:
/usr/include/pthread.h:285: error: conflicting declaration 'typedef struct pthread_st*pthread_t'
/usr/include/bits/pthreadtypes.h:150: error: 'pthread_t' has a previous declaration as `typedef long unsigned int pthread_t'
/usr/include/pthread.h:285: error: declaration of `typedef struct pthread_st*pthread_t'
I get these errors even if I uninstall pth first.
With ffmpeg2theora, make fails with reported coding errors (undefined references).
PS As the latest version of vorbis-tools is already in the repos, but in i486 form, it's probably not worth spending much more time on an i586 version?