error in installing memprof

[pulipaka ravikanth <ravikanthpulipaka gmail com>]

Hello,

 I am getting the following error when trying to install memprof. 

gem install memprof
Building native extensions.  This could take a while...
ERROR:  Error installing memprof:
    ERROR: Failed to build gem native extension.

/Users/ravikanthpulipaka/.rvm/rubies/ree-1.8.7-2010.02/bin/ruby extconf.rb
(I'm about to compile yajl.. this will definitely take a while)
  -- tar zxvf yajl-1.0.9.tar.gz
  -- sed -i -e 's,yajl,json,g' *.h *.c api/*.h
  -- /Users/ravikanthpulipaka/.rvm/rubies/ree-1.8.7-2010.02/bin/ruby extconf.rb
  -- make
*** 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=/Users/ravikanthpulipaka/.rvm/rubies/ree-1.8.7-2010.02/bin/ruby
extconf.rb:17:in `sys': make failed, please report to memprof tmm1 net with pastie.org link to /Users/ravikanthpulipaka/.rvm/gems/ree-1.8.7-2010.02@janova/gems/memprof-0.3.10/ext/mkmf.log (RuntimeError)
    from extconf.rb:51
    from extconf.rb:35:in `chdir'
    from extconf.rb:35
    from extconf.rb:31:in `chdir'
    from extconf.rb:31



I have xcode verion 3.1.3.

Thank you,
ravi