web3 install--C compiler cannot create executables
 

MacBook Pro running OS 10.13.6

I am trying to install web3 through the bash terminal. I get this error.
Error: Error: Command failed: ./configure
configure: error: in `/Users/nancyibsen/node_modules/scrypt/scrypt/scrypt-1.2.0':
configure: error: C compiler cannot create executables

From my research it looks like I need to install g++ but I could not figure out how. This is what I tried:

Nancys-MBP:~ nancyibsen$ sudo apt-get install g++
Password:
sudo: apt-get: command not found

Thanks

google is your friend. There are a lot of different solutions (available on the net).
apt is only used on debian based linux distributions.

I could not find an answer with google. That is why I posted here.

so look for: install g++ macbook