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