[Karl-Michael-Schindlers-MacBook:plugins/media/ffmpeg] michael% ./autogen.sh
You should add the contents of `/sw/share/aclocal/libtool.m4' to `aclocal.m4'.
Putting files in AC_CONFIG_AUX_DIR, `../../../../dists/autogen'.
libtoolize: `config.guess' exists: use `--force' to overwrite
libtoolize: `config.sub' exists: use `--force' to overwrite
aclocal.m4:14: error: this file was generated for autoconf 2.61.
You have another version of autoconf.  If you want to use that,
you should regenerate the build system entirely.
aclocal.m4:14: the top level
autom4te-2.63: /sw/bin/m4 failed with exit status: 63
configure.ac:46: installing `../../../../dists/autogen/missing'
Makefile.am: installing `../../../../dists/autogen/depcomp'
[Karl-Michael-Schindlers-MacBook:plugins/media/ffmpeg] michael% ./configure
./configure: Command not found.