mozilla-2.0

Build:

make -f libjs.make distclean
make -f libjs.make -j$(nproc)

Output of build in js/src/build-release

You can use distrobox to build for old gcc:

distrobox create --name ubuntu22 --image ubuntu:22.04
distrobox enter ubuntu22

Then:

sudo apt update
sudo apt install -y software-properties-common

sudo add-apt-repository universe
sudo apt update

sudo apt install -y python2.7
sudo apt install -y build-essential

sudo apt install -y libnspr4
sudo apt install -y libnspr4-dev

Then make:

make -f libjs.make -j$(nproc)

Or for debug:

make -f libjs.make debug=yes -j$(nproc)