$ ruby -rrpm -e' ' 
Traceback (most recent call last):
	1: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:92:in `require'
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file -- rpm (LoadError)
	11: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:156:in `require'
	10: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:168:in `rescue in require'
	 9: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:168:in `require'
	 8: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm.rb:2:in `<top (required)>'
	 7: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:72:in `require'
	 6: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:72:in `require'
	 5: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:3:in `<top (required)>'
	 4: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:4:in `<module:RPM>'
	 3: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:8:in `<module:C>'
	 2: from /usr/share/gems/gems/ffi-1.12.2/lib/ffi/library.rb:99:in `ffi_lib'
	 1: from /usr/share/gems/gems/ffi-1.12.2/lib/ffi/library.rb:99:in `map'
/usr/share/gems/gems/ffi-1.12.2/lib/ffi/library.rb:145:in `block in ffi_lib': Could not open library '/usr/lib/rpm': /usr/lib/rpm: cannot read file data: Is a directory. (LoadError)
Could not open library 'librpm.so': librpm.so: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.8': librpm.so.8: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.7': librpm.so.7: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.3': librpm.so.3: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.2': librpm.so.2: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.1': librpm.so.1: cannot open shared object file: No such file or directory
	9: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:156:in `require'
	8: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:168:in `rescue in require'
	7: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:168:in `require'
	6: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm.rb:2:in `<top (required)>'
	5: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:72:in `require'
	4: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:72:in `require'
	3: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:3:in `<top (required)>'
	2: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:4:in `<module:RPM>'
	1: from /usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:7:in `<module:C>'
/usr/share/gems/gems/rpm-0.0.5/lib/rpm/c.rb:13:in `rescue in <module:C>': Can't find rpm libs on your system: Could not open library '/usr/lib/rpm': /usr/lib/rpm: cannot read file data: Is a directory. (RuntimeError)
Could not open library 'librpm.so': librpm.so: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.8': librpm.so.8: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.7': librpm.so.7: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.3': librpm.so.3: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.2': librpm.so.2: cannot open shared object file: No such file or directory.
Could not open library 'librpm.so.1': librpm.so.1: cannot open shared object file: No such file or directory