Ubuntu20.04.2 LTS 上安装SRS ，到 ./configure 的时候报错，终端日志如下：
sudo ./configure
User config: --x86-x64 --prefix=/usr/local/software/srs/srs4.0
Detail config: --prefix=/usr/local/software/srs/srs4.0 --config=conf/srs.conf --hls=on --hds=off --dvr=on --ssl=on --https=on --ssl-1-0=off --ssl-local=off --sys-ssl=off --transcode=on --ingest=on --stat=on --http-callback=on --http-server=on --stream-caster=on --http-api=on --utest=off --cherrypy=off --srt=on --rtc=on --simulator=off --cxx11=on --cxx14=off --ffmpeg-fit=on --nasm=on --srtp-nasm=on --clean=on --gperf=off --gmc=off --gmd=off --gmp=off --gcp=off --gprof=off --static=off --shared-st=off --shared-srt=off --shared-ffmpeg=off --log-verbose=off --log-info=off --log-trace=on --gcov=off --debug=off --debug-stats=off --cross-build=off --cc=gcc --cxx=g++ --ar=ar --ld=ld --randlib=randlib
SRS_WORKDIR: ., SRS_OBJS_DIR: objs, SRS_OBJS: ./objs, SRS_PLATFORM: Platform-Linux-5.15.0-GCC9.4.0-SRS5-x86_64
Checking gcc/g++/gdb/make.
Required tools are ok.
Installing tools for Ubuntu.
SRT enable, install depend tools
Tools for Ubuntu are installed.
OS_IS_LOONGARCH64:, OS_IS_MIPS64:, OS_IS_LOONGSON:
SED is sed_utility
The state-threads is ok.
The openssl-1.1-fit is ok.
The libsrtp-2-fit is ok.
The opus-1.3.1 is ok.
Building ffmpeg-4-fit.
ERROR: opus not found using pkg-config
If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
Build ffmpeg-4-fit failed, ret=1
其中错误内容为：ERROR: opus not found using pkg-config。
网上各种百度都是说编译FFmpeg的时候遇到，没有编译SRS 的时候遇到吗？
有遇到国类似问题，并且解决了的马？
