Fixing Metasploit Update

When I'm trying to running msfupdate 2 weeks ago, I'm getting trouble about updating gems, the Installing pg (0.15.0) can't installed because something wrong in configuration about ruby. After 2 weeks, I can solve this.

Ok, I will started from Metasploit update, when I'm running msfupdate, I'm getting error below:

root@bt:~# msfupdate
[*]
[*] Attempting to update the Metasploit Framework...
[*]
HEAD is now at 522642a Updating mailmap
Already on 'master'
Your branch is ahead of 'origin/master' by 835 commits.
remote: Counting objects: 565, done.
Already Up to date
[*] Updating gems...
[/opt/metasploit/ruby/lib/ruby/gems/1.9.1/specifications/pg-0.15.0.gemspec] isn't a Gem::Specification (NilClass instead).
[/opt/metasploit/ruby/lib/ruby/gems/1.9.1/specifications/pg-0.15.0.gemspec] isn't a Gem::Specification (NilClass instead).
[/opt/metasploit/ruby/lib/ruby/gems/1.9.1/specifications/pg-0.15.0.gemspec] isn't a Gem::Specification (NilClass instead).
Fetching gem metadata from http://rubygems.org/.........
Fetching gem metadata from http://rubygems.org/..
Using rake (10.0.4)
Using i18n (0.6.1)
Using multi_json (1.0.4)
Using activesupport (3.2.13)
Using builder (3.0.4)
Using activemodel (3.2.13)
Using arel (3.0.2)
Using tzinfo (0.3.37)
Using activerecord (3.2.13)
Using database_cleaner (0.9.1)
Using diff-lcs (1.2.2)
Using factory_girl (4.2.0)
Using json (1.7.7)
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=${opt-dir}/include
 --with-opt-lib
 --without-opt-lib=${opt-dir}/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=${pg-dir}/include
 --with-pg-lib
 --without-pg-lib=${pg-dir}/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.

Then while you running gem install pg -v '0.15.0', you will getting error too. So modify the file rbconfig in  /opt/metasploit/ruby/lib/ruby/1.9.1/i686-linux/. Edit via vim or whatever your favourite editing text tool.

root@bt:~# vim /opt/metasploit/ruby/lib/ruby/1.9.1/i686-linux/rbconfig.rb

 Change the configuration below:

CONFIG["LIBRUBYARG_STATIC"] = "-Wl,-R -Wl,$(libdir) -L$(libdir) -l$(RUBY_SO_NAME)-static"

 With:

CONFIG["LIBRUBYARG_STATIC"] = "-Wl,-R -Wl,$(libdir) -L$(libdir) "

Save and exit. Now, you can running msfupdate, after that, you can start msfconsole again. Ok, lets go to using metasploit for making payload and exploiting the victim.