streamripper @1.64.6 configure failed for libmad
:info:configure checking build system type... configure: error: /bin/sh ./config.sub -apple-darwin20.5.0 failed
:info:configure configure: WARNING: Cache variable ac_cv_build contains a newline.
:info:configure configure: error: ./configure failed for libmad-0.15.1b
:info:configure Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_audio_streamripper/streamripper/work/streamripper-1.64.6" && ./configure --prefix=/opt/local --with-ogg=/opt/local --with-vorbis=/opt/local --with-libiconv-prefix=/opt/local --with-included-argv --with-included-libmad --with-included-tre --mandir=/opt/local/share/man --disable-rpath
:info:configure Exit code: 1
:error:configure Failed to configure streamripper: consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_audio_streamripper/streamripper/work/streamripper-1.64.6/config.log
:error:configure Failed to configure streamripper: configure failure: command execution failed
:debug:configure Error code: NONE
:debug:configure Backtrace: configure failure: command execution failed
:debug:configure while executing
:debug:configure "$procedure $targetname"
Looks like it needs a newer config.guess.