I have run into the same problem as TIM. Michaels's earlier response helped move forward a little. I have downloaded and unpacked the the sources of SUMO. They are still in my downloads folder. I am able to run the ./configure
command. But when I try to build: make -j`sysctl -n hw.ncpu`
as prescribed in the same installation guide cited above (http://sumo.dlr.de/wiki/Installing/MacOS_Build_w_Homebrew
), terminal comes back with the following message: make: *** No targets specified and no makefile found. Stop.