How to build Expat in linux/CentOS/Ubuntu/MacOS?

download tarball fron https://github.com/libexpat/libexpat/releases/download/R_2_4_8/expat-2.4.8.tar.gz 
extract files with "tar xvfz expat-2.4.8.tar.gz" 
cd expat-2.4.8
./configure --prefix=/usr/local/expat/2_4_8

make clean
make
make install

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