seems they they messed up the wget-1.20.tar.gz extracting it has a wget-1.19.5 directory name instead of wget-1.20 named directory

  tar xvzf wget-1.20.tar.gz | head -n3
  wget-1.19.5/
  wget-1.19.5/GNUmakefile
  wget-1.19.5/Makefile.am