Error when trying to install app with mysql2 gem

Question

Im trying to install an open source rails 3.2.21 application that uses the mysql2 gem, but when i try and run the bundle commant I get the followin

Answer 1

Try this:

gem install mysql2 -v '0.5.2' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include

(Update version as appropriate)

Answer 2

The combination of commands solved it me. I am on Mojave.

brew reinstall openssl && brew link openssl --force

and then

gem install mysql2 -v '0.4.10' -- \
  --with-ldflags=-L/usr/local/opt/openssl/lib \
  --with-cppflags=-I/usr/local/opt/openssl/include

Answer 3

After Homebrew update (openssl@1.1) there is a new path for libs, so may use:

bundle config build.mysql2 --with-opt-dir=$(brew --prefix openssl)
bundle install

It will fix ld: library not found for -lssl error

Answer 4

The solution for me was to install the Xcode Command Line Tools.

I had recently updated Xcode through the Mac App Store, and every time I do that, I've found that I have to reinstall the Command Line Tools again.

xcode-select --install

Answer 5

Thanks @mudasobwa for pointing me in the right direction. It turns out the error was caused by an unlinked openssl file, so running:

brew reinstall openssl && brew link openssl --force 

Solved the problem. I found the solution here: OpenSSL, RVM, Brew, conflicting error

Answer 6

The error log says:

ld: library not found for -lssl

So, you need to install libssl:

brew install openssl

---

As it was pointed out in comments, there might be a need to export the path to the library.

export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/