BUNDLER ISSUE

Hello,
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.
(Gem::Installer::ExtensionBuildError)

/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:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/Users/musdev/.rvm/rubies/ruby-1.9.1-p378/bin/ruby

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