How to install OpenMPI on Mac?

I have some issues to install Mpich2 on my MAC now. I tried to follow to some online resources, but it didn't work. My system version is 10.10.4

Here is the resources that I found online: http://www.uvm.edu/~smanchu/mpich2.html

When I tried to type "make 2>&1 | tee m.txt" The system told me: " *** No targets specified and no makefile found. Stop."

It means that something is wrong on last command which is"~/Desktop/mpich2-1.1/configure --enable-f90 -prefix=/Users/Sreedhar/mpich2-install 2>&1 | tee c.txt" and I tried to modified this command to different addresses.

Please let me know if you have any good idea about that!

Thanks a lot!!!!!!