It detects all the external file formats now, except amr-vo for wb encoding and lame for mp3 encoding (the decoders work though). Can you please test again?
Thanks for testing! Yes: none of the test for external libraries (such as ogg of flac) are there yet, that's why thay all "fail" - that is the next step. There rest are the warnings of compiling SoX itself, nothing to do with the build system, Yes, it is fast: it runs a nearly trivial shell script and that's it; unike autotools it doesn't keep checking whether you have strlen() or unistd.h etc. Please keep testing on all other systems :-)
Better version here: https://github.com/janstary/sox/tree/build
It seems to be working now.
cleanup + we have popen()
README not FEATURES
remove homegrown strcasecmp() et al.
So far one confirmation that it does not work.