Off topic:vcftools - installing on MAC

Question

[F_cm_C]

I'm trying to install vcftools on mac. Looking at previous posts on this issue, I made sure I've got Mac OS X developer tools (http://www.cnet.com/how-to/install-command-line-developer-tools-in-os-x/). I followed the procedure recommended in the official documantion (https://vcftools.github.io/examples.html). When I run from the command line:

./configure.ac

I get the following errors:

./configure.ac: line 4: syntax error near unexpected token [2.63]'   
./configure.ac: line 4:AC_PREREQ([2.63])'

If I try:

./configure

It says:

-bash: ./configure: No such file or directory

as indeed there in no ./configure when I inspect the contents with:

ls

Can anyone point out where I am doing wrong. I've tried resources such as 'homebrew' but I didn't help.

Thanks a lot.