ruby-debug Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers

Question

My Rails is 3.2.1.4, Ruby is 1.9.3p448.

I got an error when I install ruby-debug:

Building native extensions.          


        

Answer 1

I am using Mac El Capitan. In my case it was caused by the missing developer tool. I solved it by installing the developer tool via xcode-select --install. After that bundle install worked fine again.