tce-load -i compiletc meson 

wget https://github.com/cisco/openh264/archive/refs/tags/2.5.1.tar.gz

cd openh264-2.5.1

mkdir build
cd build

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" meson setup --prefix=/usr/local --localstatedir=/var --buildtype=plain -Dtests=disabled

ninja [0m 41.11s]
sudo ninja install

openh264 2.5.1

  User defined options
    buildtype    : plain
    localstatedir: /var
    prefix       : /usr/local
    tests        : disabled