mac 安裝 wget

http://ftp.gnu.org/gnu/wget/wget-1.13.4.tar.gz

or 

curl -O http://ftp.gnu.org/gnu/wget/wget-1.13.4.tar.gz

tar xzvf wget-1.13.4.tar.gz
cd wget-1.13.4
./configure --with-ssl=openssl
make
sudo make install
which wget #Should output: /usr/local/bin/wget