make[1]: Entering directory `/home/amd/code/yarv/ext/zlib'
make[1]: Nothing to be done for `install'.
make[1]: Leaving directory `/home/amd/code/yarv/ext/zlib'
Generating RDoc documentation
./miniruby ./runruby.rb --extout=.ext -- "./bin/rdoc" --all --ri --op "/home/amd/opt/share/ri/1.9/system" "."
"./ruby ./bin/rdoc --all --ri --op /home/amd/opt/share/ri/1.9/system ."
/home/amd/code/yarv/lib/getoptlong.rb:305:in `raise': no argument-flag (ArgumentError)
        from /home/amd/code/yarv/lib/getoptlong.rb:305:in `block in set_options'
        from /home/amd/code/yarv/lib/getoptlong.rb:292:in `each'
        from /home/amd/code/yarv/lib/getoptlong.rb:292:in `set_options'
        from /home/amd/code/yarv/lib/getoptlong.rb:191:in `initialize'
        from /home/amd/code/yarv/lib/rdoc/options.rb:389:in `new'
        from /home/amd/code/yarv/lib/rdoc/options.rb:389:in `parse'
        from /home/amd/code/yarv/lib/rdoc/rdoc.rb:256:in `document'
        from ./bin/rdoc:63:in `<main>'
make: *** [do-install-doc] Error 1