Linux - Gem Fehler beim Installieren von PG

Ich gewöhne mich an Linux und mache derzeit einen Wechsel zu Backtrack 5, um in Sicherheit zu üben. Ich führe msfupdate aus, das eine Reihe von Gem-Dateien installiert. Während der Installation von PG von gem bekomme ich diese Fehlermeldung. Wie kann ich das Problem beheben?

Installing pg (0.15.0) with native extensions  Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.  /opt/metasploit/ruby/bin/ruby extconf.rb  checking for pg_config... yes Using config values from /opt/metasploit/postgresql/bin/pg_config checking for libpq-fe.h... *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.  Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=$/include --with-opt-lib --without-opt-lib=$/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/opt/metasploit/ruby/bin/ruby --with-pg --without-pg --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=$/include --with-pg-lib --without-pg-lib=$/lib --with-pg-config --without-pg-config --with-pg_config --without-pg_config /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:970:in `block in find_header' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:280:in `postpone' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for' from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:969:in `find_header' from extconf.rb:43:in `<main>'   Gem files will remain installed in /opt/metasploit/ruby/lib/ruby/gems/1.9.1/gems/pg-0.15.0 for inspection. Results logged to /opt/metasploit/ruby/lib/ruby/gems/1.9.1/gems/pg-0.15.0/ext/gem_make.out An error occured while installing pg (0.15.0), and Bundler cannot continue. Make sure that `gem install pg -v '0.15.0'` succeeds before bundling.