Compiling MicroPython v1.7 works fine on Mac OS X, but running the install target of the Makefile in the subfolder unix fails with following error (relevant excerpt):

install -D micropython /usr/local/Cellar/micropython/1.7/bin/micropython
install: illegal option -- D
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 file2
       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 ... fileN directory
       install -d [-v] [-g group] [-m mode] [-o owner] directory ...
make: *** [install] Error 64

This is likely due to the incompatible flag -D which is only available for the install command contained in GNU coreutils, but not in the BSD version of install.

As solution I suggest to run install -d on the install directory first and then call install for the two files seperately. I've successfully used this approach for the package in the Homebrew package manager (see: Homebrew/homebrew-core#353).