How to build it?

[zhiweiwo]

When I execute ./configure It reminds me:

configure: error: Package requirements (opus >= 1.1) were not met:

Requested 'opus >= 1.1' but version of Opus is unknown
You may find new versions of Opus at https://opus-codec.org/

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables DEPS_CFLAGS
and DEPS_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

But I did it export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig