build: try to find getopt in macOS homebrew's standard location
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drwxr-xr-x - .github
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-rw-r--r-- 179 BSDmakefile
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-rw-r--r-- 18092 LICENSE
-rw-r--r-- 3999 Makefile
-rw-r--r-- 3447 README.md
drwxr-xr-x - config
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drwxr-xr-x - include
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drwxr-xr-x - package
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drwxr-xr-x - scripts
drwxr-xr-x - target
drwxr-xr-x - toolchain
drwxr-xr-x - tools