error installing xapian core gem
===

Building native extensions.  This could take a while...
ERROR:  Error installing xapian-core:
	ERROR: Failed to build gem native extension.

        rake1.8 RUBYARCHDIR=/usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1/lib RUBYLIBDIR=/usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1/lib
sh: rake1.8: not found


Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1/ext/gem_make.out

Here is the gem makeout file `rake1.8 RUBYARCHDIR=/usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1/lib RUBYLIBDIR=/usr/lib/ruby/gems/1.8/gems/xapian-core-1.2.7.1/lib
sh: rake1.8: not found
`