title: RubyGems Building Native Extensions Fails on Fedora 23
body: <p>First I Try:
   <code>gem install rails</code></p>
  
  <p>It Produces:</p>
  
  <pre><code>Building native extensions.  This could take a while...
  ERROR:  Error installing rails:
      ERROR: Failed to build gem native extension.
  
      /usr/bin/ruby 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=/usr/bin/$(RUBY_BASE_NAME)
      --help
      --clean
  /usr/share/ruby/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
  You have to install development tools first.
      from /usr/share/ruby/mkmf.rb:571:in `block in try_compile'
      from /usr/share/ruby/mkmf.rb:522:in `with_werror'
      from /usr/share/ruby/mkmf.rb:571:in `try_compile'
      from extconf.rb:80:in `nokogiri_try_compile'
      from extconf.rb:87:in `block in add_cflags'
      from /usr/share/ruby/mkmf.rb:619:in `with_cflags'
      from extconf.rb:86:in `add_cflags'
      from extconf.rb:336:in `&lt;main&gt;'
  
  
  Gem files will remain installed in /home/hagoth/.gem/ruby/gems/nokogiri-1.6.7.2 for inspection.
  Results logged to /home/hagoth/.gem/ruby/gems/nokogiri-1.6.7.2/ext/nokogiri/gem_make.out
  </code></pre>
  
  <p>I've installed development tools using <code>sudo dnf install ruby-devel</code>  Also tried it with <code>rvm requirements</code>  And I've spent the past five hours or so trying other obscure solutions online.  None of them seem to have worked.  Is there some simple obvious solution that I'm missing? I'm fairly sure the dependencies are there.  Though I may be wrong.</p>
  
  <p>Running 32 bit version of Fedora 23 if that means anything.</p>
  
  <p><strong>Update:</strong> </p>
  
  <p>The contents of <code>/home/username/.gem/ruby/gems/nokogiri-1.6.7.2/ext/nokogiri/mkmf.log</code> are:</p>
  
  <pre><code>"gcc -o conftest -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.  -D_FILE_OFFSET_BITS=64  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -march=i686 -mtune=atom -fasynchronous-unwind-tables -fPIC  conftest.c  -L. -L/usr/lib -L. -Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -fstack-protector -rdynamic -Wl,-export-dynamic  -m32   -lruby  -lpthread -ldl -lcrypt -lm   -lc "
  gcc: error: /usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory
  checked program was:
  /* begin */
  1: #include "ruby.h"
  2: 
  3: int main(int argc, char **argv)
  4: {
  5:   return 0;
  6: }
  /* end */
  </code></pre>