Tracking updates to dependencies

[phyninja]

On MacOS Catalina (10.15.7), bundle install failed on the following dependencies, with similar error codes:
ffi (1.9.18) [Dependency tree: guard-rspec (4.7.3) -> guard (2.14.1) -> listen (3.1.5) -> rb-inotify (0.9.10) -> ffi (1.9.18)]
pg (0.18.4)
thin (1.7.2)

As documented on several sites, the error relates to the fact that

Clang now enables -Werror=implicit-function-declaration by default:

Clang now reports an error when you use a function without an explicit declaration when building C or Objective-C code for macOS (-Werror=implicit-function-declaration flag is on). This additional error detection unifies Clang’s behavior for iOS/tvOS and macOS 64-bit targets for this diagnostic. (49917738)

I was able to workaround the issues by using the following commands:

bundle config build.ffi --with-cflags="-Wno-error=implicit-function-declaration"
bundle config build.pg --with-cflags="-Wno-error=implicit-function-declaration"
bundle config build.thin --with-cflags="-Wno-error=implicit-function-declaration"
bundle install

References:
ffi/ffi#611 (comment)
https://stackoverflow.com/questions/36455625/postgresql-gem-install-pg-0-18-4-passes-bundle-install-fails

Originally posted by @rylanb in #167 (comment)

[phyninja]

Closed because the issue is tied to a particular machine['s configuration], and not the app.