wget -c https://github.com/libexpat/libexpat/releases/download/R_2_4_1/expat-2.4.1.tar.xz
tar -xJf expat-2.4.1.tar.xz
cd expat-2.4.1
mkdir -p build
cd build
../configure --prefix="/usr"
make # Doesn't mind -j#
make install