So I had to reinitialize a project after my pc crashed and am in the process of reinstalling all my gems on ruby. Unfortunately when I run bundle install I get the following error.
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
current directory: /usr/lib/ruby/gems/2.3.0/gems/pg-0.21.0/ext
/usr/bin/ruby2.3 -r ./siteconf20170925-462-dsymf.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
extconf failed, exit code 1
Gem files will remain installed in /usr/lib/ruby/gems/2.3.0/gems/pg-0.21.0
Results logged to /usr/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0/pg-
sudo sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main' > /etc/apt/sources.list.d/pgdg.list" wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add - sudo apt-get update sudo apt-get install postgresql-common sudo apt-get install postgresql-9.5 libpq-dev
gem install pg
Recommend with ruby 2.4.2