lars@d14816859b44:/home/lars/comcard/nokogiri$ rvm install 2.2.3 
Searching for binary rubies, this might take some time. 
Found remote file https://rubies.travis-ci.org/ubuntu/14.04/x86_64/ruby-2.2.3.tar.bz2 
Checking requirements for ubuntu. 
Requirements installation successful. 
ruby-2.2.3 - #configure 
ruby-2.2.3 - #download 
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current 
                                Dload  Upload   Total   Spent    Left  Speed 
 0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0 
100 22.9M  100 22.9M    0     0   864k      0  0:00:27  0:00:27 --:--:-- 1232k 
No checksum for downloaded archive, recording checksum in user configuration. 
ruby-2.2.3 - #validate archive 
ruby-2.2.3 - #extract 
ruby-2.2.3 - #validate binary 
ruby-2.2.3 - #setup 
ruby-2.2.3 - #gemset created /usr/local/rvm/gems/ruby-2.2.3@global 
ruby-2.2.3 - #importing gemset /usr/local/rvm/gemsets/global.gems................................... 
ruby-2.2.3 - #generating global wrappers........ 
ruby-2.2.3 - #gemset created /usr/local/rvm/gems/ruby-2.2.3 
ruby-2.2.3 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list 
ruby-2.2.3 - #generating default wrappers........ 
lars@d14816859b44:/home/lars/comcard/nokogiri$  
lars@d14816859b44:/home/lars/comcard/nokogiri$  
lars@d14816859b44:/home/lars/comcard/nokogiri$ ldd /usr/local/rvm/rubies/ruby-2.2.3/lib/libruby.so 
       linux-vdso.so.1 =>  (0x00007ffd3c640000) 
       libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fc87bfde000) 
       libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007fc87bd6a000) 
       libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc87bb66000) 
       libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007fc87b92d000) 
       libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc87b627000) 
       libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc87b262000) 
       /lib64/ld-linux-x86-64.so.2 (0x00007fc87c6dc000)

/home/gerald/.rvm/rubies/ruby-2.2.3/bin/ruby -r ./siteconf20150905-15835-17vnavf.rb extconf.rb
checking if the C compiler accepts ... *** 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/gerald/.rvm/rubies/ruby-2.2.3/bin/$(RUBY_BASE_NAME)
    --help
    --clean
/home/gerald/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /home/gerald/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:571:in `block in try_compile'
    from /home/gerald/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:522:in `with_werror'
    from /home/gerald/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:571:in `try_compile'
    from extconf.rb:80:in `nokogiri_try_compile'
    from extconf.rb:87:in `block in add_cflags'
    from /home/gerald/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:619:in `with_cflags'
    from extconf.rb:86:in `add_cflags'
    from extconf.rb:337:in `<main>'

extconf failed, exit code 1

"gcc -o conftest -I/home/gerald/.rvm/rubies/ruby-2.2.3/include/ruby-2.2.0/x86_64-linux -I/home/gerald/.rvm/rubies/ruby-2.2.3/include/ruby-2.2.0/ruby/backward -I/home/gerald/.rvm/rubies/ruby-2.2.3/include/ruby-2.2.0 -I.     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  conftest.c  -L. -L/home/gerald/.rvm/rubies/ruby-2.2.3/lib -Wl,-R/home/gerald/.rvm/rubies/ruby-2.2.3/lib -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,'/../lib' -Wl,-R'/../lib' -lruby  -lpthread -lgmp -ldl -lcrypt -lm   -lc "
/usr/bin/ld: cannot find -lgmp
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

gerald@gerald-VirtualBox:~/code/rails-i18n$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.3 LTS
Release:    14.04
Codename:   trusty
gerald@gerald-VirtualBox:~/code/rails-i18n$ ruby -v
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]