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 means that it can't find the gmp library. Try running:

sudo apt-get install libgmp3-dev

Then bundle.