ruby.rb

Building native extensions.  This could take a while...
ERROR:  Error installing rugged:
        ERROR: Failed to build gem native extension.

    /usr/bin/ruby -r ./siteconf20151002-16242-iir85r.rb extconf.rb
checking for gmake... no
checking for make... yes
checking for cmake... yes
checking for pkg-config... yes
 -- cmake .. -DBUILD_CLAR=OFF -DTHREADSAFE=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_C_FLAGS=-fPIC -DCMAKE_BUILD_TYPE=RelWithDebInfo -G "Unix Makefiles"
 -- /usr/bin/make
checking for main() in -lgit2... *** 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/$(RUBY_BASE_NAME)
        --use-system-libraries
        --with-git2-dir
        --without-git2-dir
        --with-git2-include
        --without-git2-include=${git2-dir}/include
        --with-git2-lib
        --without-git2-lib=${git2-dir}/lib
        --with-git2lib
        --without-git2lib
/usr/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 /usr/lib/ruby/2.2.0/mkmf.rb:541:in `try_link0'
        from /usr/lib/ruby/2.2.0/mkmf.rb:556:in `try_link'
        from /usr/lib/ruby/2.2.0/mkmf.rb:735:in `try_func'
        from /usr/lib/ruby/2.2.0/mkmf.rb:966:in `block in have_library'
        from /usr/lib/ruby/2.2.0/mkmf.rb:911:in `block in checking_for'
        from /usr/lib/ruby/2.2.0/mkmf.rb:351:in `block (2 levels) in postpone'
        from /usr/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/lib/ruby/2.2.0/mkmf.rb:351:in `block in postpone'
        from /usr/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/lib/ruby/2.2.0/mkmf.rb:347:in `postpone'
        from /usr/lib/ruby/2.2.0/mkmf.rb:910:in `checking_for'
        from /usr/lib/ruby/2.2.0/mkmf.rb:961:in `have_library'
        from extconf.rb:89:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /home/ozz/.gem/ruby/2.2.0/gems/rugged-0.23.2 for inspection.
Results logged to /home/ozz/.gem/ruby/2.2.0/extensions/x86-linux/2.2.0/rugged-0.23.2/gem_make.out