git에서 libopus 를 다운로드 하여 빌드하려고 시도했지만
Updating build configuration files, please wait....
configure.ac:38: warning: macro 'AM_PROG_LIBTOOL' not found in library
configure.ac:38: error: possibly undefined macro: AM_PROG_LIBTOOL
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1
이 오류를 어떻게 해결합니까?