[ruby-it] [Ubuntu] Problema installazione gemma Postgres

[Yuri Redaelli]

Ciao a tutti,

sto cercando di usare Postgres con Rails ma se tento di installare la
gemma relativa incorro in questo errore:

WARNING:  Installing to ~/.gem since /var/lib/gems/1.8 and
    /var/lib/gems/1.8/bin aren't both writable.
WARNING:  You don't have /home/yuri/.gem/ruby/1.8/bin in your PATH,
    gem executables will not run.
Building native extensions.  This could take a while...
ERROR:  Error installing postgres:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:46:in `require': no such file to load -- mkmf (LoadError)
  from extconf.rb:46


Gem files will remain installed in
/home/yuri/.gem/ruby/1.8/gems/postgres-0.7.9.2008.01.28 for inspection.
Results logged to
/home/yuri/.gem/ruby/1.8/gems/postgres-0.7.9.2008.01.28/ext/gem_make.out

Avete dei suggerimenti?

Grazie in anticipo.
-- 
Posted via http://www.ruby-forum.com/.