gistfile1.txt

/usr/local/bin/ruby extconf.rb install /tmp/ruby-libvirt-0.1.0.gem -- --with-_libvirt=/usr/lib
*** 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/local/bin/ruby
	--with-_libvirt-dir
	--without-_libvirt-dir
	--with-_libvirt-include
	--without-_libvirt-include=${_libvirt-dir}/include
	--with-_libvirt-lib
	--without-_libvirt-lib=${_libvirt-dir}/lib
	--with-libvirt-config
	--without-libvirt-config
	--with-pkg-config
	--without-pkg-config
extconf.rb:16: libvirt not found (RuntimeError)

lack libvirt-devel package
yum install libvirt-devel