build fails installing linecache19 gem on a ruby 1.9 server

```
Using ruby_core_source (0.1.5)
Installing linecache19 (0.5.12) with native extensions /usr/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:529:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

/usr/bin/ruby19 extconf.rb
checking for vm_core.h... no
checking for vm_core.h... no
*** 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=/usr/bin/ruby19
--with-ruby-dir
--without-ruby-dir
--with-ruby-include
--without-ruby-include=${ruby-dir}/include
--with-ruby-lib
--without-ruby-lib=${ruby-dir}/lib
/usr/lib/ruby/1.9.1/fileutils.rb:243:in `mkdir': Permission denied - /usr/include/ruby-1.9.1/ruby-1.9.2-p180 (Errno::EACCES)
from /usr/lib/ruby/1.9.1/fileutils.rb:243:in `fu_mkdir'
from /usr/lib/ruby/1.9.1/fileutils.rb:217:in `block (2 levels) in mkdir_p'
from /usr/lib/ruby/1.9.1/fileutils.rb:215:in `reverse_each'
from /usr/lib/ruby/1.9.1/fileutils.rb:215:in `block in mkdir_p'
from /usr/lib/ruby/1.9.1/fileutils.rb:201:in `each'
from /usr/lib/ruby/1.9.1/fileutils.rb:201:in `mkdir_p'
from /usr/lib/ruby/gems/1.9.1/gems/ruby_core_source-0.1.5/lib/ruby_core_source.rb:59:in `block in create_makefile_with_core'
from /usr/lib/ruby/1.9.1/tempfile.rb:320:in `open'
from /usr/lib/ruby/gems/1.9.1/gems/ruby_core_source-0.1.5/lib/ruby_core_source.rb:51:in `create_makefile_with_core'
from extconf.rb:19:in `'
Requesting http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p180.tar.gz
Downloading http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p180.tar.gz

Gem files will remain installed in /home/deploy/.bundler/tmp/9662/gems/linecache19-0.5.12 for inspection.
Results logged to /home/deploy/.bundler/tmp/9662/gems/linecache19-0.5.12/ext/trace_nums/gem_make.out
from /usr/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:507:in `block in build_extensions'
from /usr/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:482:in `each'
from /usr/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:482:in `build_extensions'
from /usr/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:156:in `install'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/source.rb:101:in `block in install'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:78:in `preserve_paths'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/source.rb:91:in `install'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:58:in `block (2 levels) in run'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:93:in `with_build_args'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:57:in `block in run'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `block in each'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:49:in `run'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:8:in `install'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/cli.rb:222:in `install'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `run'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/base.rb:389:in `start'
from /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/bin/bundle:13:in `'
from /usr/bin/bundle:19:in `load'
from /usr/bin/bundle:19:in `'
Build step 'Execute shell' marked build as failure
Finished: FAILURE
```