cd /path/to/CLUSTALW
tar -xvf clustalw-2.1.tar.gz
cd clustalw-2.1
mv config.guess config.guess_bak mv config.sub config.sub_bak cp /usr/share/automake-1.16/config.* .
./configure --prefix=/path/to/CLUSTALW
make make install
ll /path/to/CLUSTALW/bin/clustalw2
export PATH=/path/to/CLUSTALW/bin:$PATH