An error occurred while installing debug_inspector (0.0.2), and Bundler cannot continue

Question

Migrating my rails app from 3.2 to 4.0.0 and ruby 2.2.2 to 2.2.4

while doing bundle install am getting (An error occurred while installing debug_inspector (0.0.2), and B

Answer 1

/usr/bin/ld: cannot find -lgmp

You're missing the linux library gmp-devel

Also, https://github.com/CocoaPods/CocoaPods/issues/1727 indicates that the later issues might be down to bundler not being able to locate a version of gcc on your linux box.