./configure --disable-install-rdoc --prefix=/
make -j4
make install DESTDIR=/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/minitest-5.10.1.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/minitest-5.10.1.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/rake-12.0.0.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/rake-12.0.0.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/xmlrpc-0.2.1.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/xmlrpc-0.2.1.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/net-telnet-0.1.1.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/net-telnet-0.1.1.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/test-unit-3.2.3.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/test-unit-3.2.3.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/did_you_mean-1.1.0.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/did_you_mean-1.1.0.gem'
Unable to open /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/power_assert-0.4.1.gem for writing: [Errno 13] Permission denied: '/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/gems/2.4.0/cache/power_assert-0.4.1.gem'
Installing gems...
/home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/2.4.0/rubygems.rb:9:in `require': cannot load such file -- rbconfig (LoadError)
	from /home/ubuntu/autopkgtest_tmp/tmp7rnyg0f_/parts/ruby-gem-install/install/lib/ruby/2.4.0/rubygems.rb:9:in `<top (required)>'
	from <internal:gem_prelude>:4:in `require'
	from <internal:gem_prelude>:4:in `<internal:gem_prelude>'