fredemmott@fredemmott-fb Formula % brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!
Warning: "config" scripts exist outside your system or Homebrew directories.

./configure scripts often look for *-config scripts to determine if

software packages are installed, and which additional flags to use when

compiling and linking.
Having additional scripts in your path can confuse software installed via

Homebrew if the config script overrides a system or Homebrew-provided

script of the same name. We found the following "config" scripts:

/opt/homebrew/bin/pkg-config

/opt/homebrew/bin/python2-config

/opt/homebrew/bin/python3.6m-config

/opt/homebrew/bin/python3.7-config

/opt/homebrew/bin/python2.7-config

/opt/homebrew/bin/python3.7m-config

/opt/homebrew/bin/ksba-config

/opt/homebrew/bin/python-config

/opt/homebrew/bin/libassuan-config

/opt/homebrew/bin/pcre2-config

/opt/homebrew/bin/gpg-error-config

/opt/homebrew/bin/python3.6-config

/opt/homebrew/bin/python3.8-config

/opt/homebrew/bin/libgcrypt-config

/opt/homebrew/bin/pth-config
Warning: Unbrewed dylibs were found in /usr/local/lib.

If you didn't put them there on purpose they could cause problems when

building Homebrew formulae, and may need to be deleted.
Unexpected dylibs:

/usr/local/lib/libiperf.0.dylib

/usr/local/lib/libjson-c.2.dylib

/usr/local/lib/libykpers-1.1.dylib

/usr/local/lib/libyubikey.0.dylib

/usr/local/lib/libyubikey.dylib
Warning: Unbrewed header files were found in /usr/local/include.

If you didn't put them there on purpose they could cause problems when

building Homebrew formulae, and may need to be deleted.
Unexpected header files:

/usr/local/include/iperf_api.h
Warning: Unbrewed .la files were found in /usr/local/lib.

If you didn't put them there on purpose they could cause problems when

building Homebrew formulae, and may need to be deleted.
Unexpected .la files:

/usr/local/lib/libiperf.la
Warning: Unbrewed static libraries were found in /usr/local/lib.

If you didn't put them there on purpose they could cause problems when

building Homebrew formulae, and may need to be deleted.
Unexpected static libraries:

/usr/local/lib/libiperf.a

/usr/local/lib/libyubikey.a
Warning: You have unlinked kegs in your Cellar.

Leaving kegs unlinked can lead to build-trouble and cause brews that depend on

those kegs to fail to run properly once built. Run brew link on these:

hhvm-4.55

hhvm-4.52

hhvm-4.53

python

libyubikey

hhvm-local

ykpers

lz4

hhvm-4.25

hhvm-4.49

hhvm-4.47

hhvm-4.23

hhvm-4.1

hhvm-4.8

hhvm-4.15

hhvm-4.34

hhvm-4.51

hhvm-4.56

hhvm-4.35

hhvm-4.57

hhvm-4.50

hhvm-4.44

hhvm-4.10

hhvm-4.4

hhvm-4.3

hhvm-4.45

hhvm-4.42

hhvm-4.5

hhvm-4.20

hhvm-preview
Warning: Some installed formulae are not readable:

hhvm-preview: undefined method `undent' for #String:0x00007f81a83bd1d0
Warning: You have uncommitted modifications to Homebrew/brew.

If this is a surprise to you, then you should stash these modifications.

Stashing returns Homebrew to a pristine state but can be undone

should you later need to do so for some reason.

cd /usr/local/Homebrew && git stash && git clean -d -f
Uncommitted files:

M Library/Homebrew/formula_installer.rb
Warning: An outdated version (2.13.5) of Git was detected in your PATH.

Git 2.14.3 or newer is required for Homebrew.

Please upgrade:

brew install git
Warning: Homebrew's sbin was not found in your PATH but you have installed

formulae that put executables in /usr/local/sbin.

Consider setting the PATH for example like so:

echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.zshrc
Warning: Broken symlinks were found. Remove them with brew cleanup:

/usr/local/bin/yapf