xmp natively supports the IRIX audio system (although its an open question as to how bit-rotten this is), but needs a couple of changes to remove GNU-isms and gnulib to provide getopt_long.
Created attachment 231103 [details] xmp-3.1.0 ebuild for Prefix (This package also needs the latest IRIX-MIPSpro-wrapper, to transmute '-qchars=signed' to '-signed': Bug 223351)
We are sorry to close this bug. We lack the man-power and devotion to support mips-irix in the tree.