I need to install gcc cross compiler that generates ELF, and I found this site - http://time.to.pullthepl.ug/blog/2014/2/3/xv6-on-mac-os-x/
It points to a github for home-brew-gcc_cross_compilers (https://github.com/jinmel/homebrew-gcc_cross_compilers), and put them in homebrew formulas, but I'm not sure exactly how to put them in the formula.
Then, how to download the github code into home-brew formulas to invoke brew install i386-elf-gcc?
The directory where the downloaded rb files are stored is /usr/local/Library/Formula, then run the brew command to install.
The log files can be found in /Users/smcho/Library/Logs/Homebrew.
Or, I could point to where the rb file is located.
brew install https://raw.githubusercontent.com/Gallopsled/pwntools-binutils/master/osx/binutils-$ARCH.rb
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