Bundler issue

When I run bundle install I get the following error message below. Can
someone please give me some assistance. Thanks

ERROR: Failed to build gem native extension.

/Users/musdev/.rvm/rubies/ruby-1.9.1-p378/bin/ruby extconf.rb
Can’t handle 1.9.x yet
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:

Gem files will remain installed in
/Users/musdev/.rvm/gems/ruby-1.9.1-p378/gems/linecache-0.43 for
Results logged to

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