tce-load -i compiletc meson 

wget https://get.videolan.org/libdvdcss/1.6.0/libdvdcss-1.6.0.tar.xz

cd libdvdcss-1.6.0

mkdir build
cd build

CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" meson setup --prefix=/usr/local --localstatedir=/var --buildtype=plain

ninja [0m 1.11s]
sudo ninja install

libdvdcss 1.6.0

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