if ! test -f "${real_ffmpeg_tree}/libavcodec/libavcodecaltivec.a"; then
dnl The given libavcodecaltivec wasn't built
AC_MSG_RESULT(no)
AC_MSG_ERROR([cannot find ${real_ffmpeg_tree}/libavcodec/libavcodecaltivec.a, make sure you compiled libavcodecaltivec in ${with_ffmpeg_tree}])
fi
if ! fgrep -s "pp_get_context" "${real_ffmpeg_tree}/libavcodec/libavcodecaltivec.a"; then
dnl The given libavcodecaltivec wasn't built with --enable-pp
AC_MSG_RESULT(no)
AC_MSG_ERROR([${real_ffmpeg_tree}/libavcodec/libavcodecaltivec.a was not compiled with postprocessing support, make sure you configured ffmpeg with --enable-pp])