Error installing rb-gsl gem on ubuntu

While installing rb-gsl gem on my gemset from ruby 2.1.0 got an error trailed like below

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/praveen/.rvm/rubies/ruby-2.1.5/bin/ruby -r ./siteconf20150115-4389-1qh8ghv.rb extconf.rb
extconf.rb:6: warning: Insecure world writable dir /opt/android-sdk in PATH, mode 040777
*** ERROR: missing required library to compile this module: No such file or directory - gsl-config
*** 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=/home/praveen/.rvm/rubies/ruby-2.1.5/bin/ruby
    --with-gsl-version

extconf failed, exit code 1

Gem files will remain installed in /home/praveen/.rvm/gems/ruby-2.1.5/gems/rb-gsl-1.16.0.2 for inspection.
Results logged to /home/praveen/.rvm/gems/ruby-2.1.5/extensions/x86_64-linux/2.1.0/rb-gsl-1.16.0.2/gem_make.out

there is one system dependency that is required to pursue further in ubuntu install libgsl0-dev package, install it like..

sudo apt-get install libgsl0-dev

That's it now retry installing rb-gsl gem.. it worked for me :)