gem install ffi でエラーになってしまう

sudo gem install ffi -v '1.9.23'
で原因不明のエラーが起きてしまっています。

これまでに試したことは幾つかあり

$softwareupdate --install -a
$brew upgrade
$brew update

など試してみたのですが全く動かずエラーからも何をすればいいかがわからず丸一日費やしてしまい、こちらに質問させていただいております。

近いところで
sudo gem install -n /usr/local/bin sass
もやってみたのですが、結局ほぼおなじエラーメッセージが返ってくるだけで進歩がない状態です。

sudo gem install ffi -v '1.9.23'
Building native extensions. This could take a while...
ERROR:  Error installing ffi:
	ERROR: Failed to build gem native extension.

    current directory: /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/ffi-1.9.23/ext/ffi_c
/Users/NAME/.rvm/rubies/ruby-2.4.0/bin/ruby -r ./siteconf20180306-14300-1yeut6m.rb extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... yes
checking for ffi_call() in -lffi... yes
checking for ffi_closure_alloc()... no
checking for ffi_raw_call()... no
checking for shlwapi.h... no
checking for rb_thread_blocking_region()... no
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
creating extconf.h
creating Makefile

current directory: /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/ffi-1.9.23/ext/ffi_c
make "DESTDIR=" clean
/Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem make (>= 0.a) with executable make (Gem::GemNotFoundException)
	from /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems.rb:308:in `activate_bin_path'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/make:22:in `<main>'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'

current directory: /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/ffi-1.9.23/ext/ffi_c
make "DESTDIR="
/Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem make (>= 0.a) with executable make (Gem::GemNotFoundException)
	from /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems.rb:308:in `activate_bin_path'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/make:22:in `<main>'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
	from /Users/NAME/.rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'

make failed, exit code 1

Gem files will remain installed in /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/ffi-1.9.23 for inspection.
Results logged to /Users/NAME/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0/ffi-1.9.23/gem_make.out

Brew doctorで確認したものは以下になります。

api $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 what 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:
  /Users/NAME/anaconda/bin/libdynd-config
  /Users/NAME/anaconda/bin/python3.5m-config
  /Users/NAME/anaconda/bin/freetype-config
  /Users/NAME/anaconda/bin/xslt-config
  /Users/NAME/anaconda/bin/libpng16-config
  /Users/NAME/anaconda/bin/libpng-config
  /Users/NAME/anaconda/bin/xml2-config
  /Users/NAME/anaconda/bin/python3.5-config
  /Users/NAME/anaconda/bin/python3-config
  /Users/NAME/anaconda/bin/curl-config
  /Users/NAME/.pyenv/shims/libdynd-config
  /Users/NAME/.pyenv/shims/python3.5m-config
  /Users/NAME/.pyenv/shims/llvm-config
  /Users/NAME/.pyenv/shims/python2-config
  /Users/NAME/.pyenv/shims/python3.4m-config
  /Users/NAME/.pyenv/shims/python3.6m-config
  /Users/NAME/.pyenv/shims/python2.7-config
  /Users/NAME/.pyenv/shims/python3.5-config
  /Users/NAME/.pyenv/shims/python-config
  /Users/NAME/.pyenv/shims/python3-config
  /Users/NAME/.pyenv/shims/python3.6-config
  /Users/NAME/.pyenv/shims/python3.4-config
  /Users/NAME/.pyenv/shims/libpng15-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/libbitcoinconsensus.0.dylib
  /usr/local/lib/libportaudio.2.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/bitcoinconsensus.h
  /usr/local/include/portaudio.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/libbitcoinconsensus.la
  /usr/local/lib/libportaudio.la

Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
  /usr/local/lib/pkgconfig/libbitcoinconsensus.pc
  /usr/local/lib/pkgconfig/portaudio-2.0.pc

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/libbitcoinconsensus.a
  /usr/local/lib/libportaudio.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:
  numpy
  portaudio
  node
  git

Warning: /usr/bin occurs before /usr/local/bin
This means that system-provided programs will be used instead of those
provided by Homebrew. The following tools exist at both paths:
  idle
  easy_install
  pydoc
  python
  python-config
  git-cvsserver
  git-shell
  git-upload-pack
  tar
  git

Consider setting your PATH so that /usr/local/bin
occurs before /usr/bin. Here is a one-liner:
  echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bash_profile

Warning: Some keg-only formulae are linked into the Cellar.
Linking a keg-only formula, such as gettext, into the cellar with
`brew link <formula>` will cause other formulae to detect them during
the `./configure` step. This may cause problems when compiling those
other formulae.

Binaries provided by keg-only formulae may override system binaries
with other strange results.

You may wish to `brew unlink` these brews:
  openssl

よろしくお願いします。