Hi, I'm not clear which causes this issue, rubygems or hpricot. $ sudo ruby19 -v `which gem19` install hpricot ruby 1.9.0 (2008-09-30 revision 19631) [i686-linux] Building native extensions. This could take a while... Successfully installed hpricot-0.6.161 1 gem installed Installing ri documentation for hpricot-0.6.161... Installing RDoc documentation for hpricot-0.6.161... $ ruby19 -v -e 'puts $:.grep(/hpricot/)' ruby 1.9.0 (2008-09-30 revision 19631) [i686-linux] /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/lib/universal-darwin9.0 /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/lib /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/bin $ file /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/lib/universal-darwin9.0/* /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/lib/universal-darwin9.0/fast_xs.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped /usr/lib/ruby/gems/1.9.0/gems/hpricot-0.6.161/lib/universal-darwin9.0/hpricot_scan.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped -- Nobu Nakada