Ruby on Rails

Hi,
   I tried to install ruby-ldap 0.9.9 on ubuntu 10.04 with ruby 1.8.7.
but i get the error. can anyone help me out?

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

/usr/bin/ruby1.8 extconf.rb
--with-openldap2
checking for ldap.h... no
checking for lber.h... no
checking for ldap_ssl.h... no
*** 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=/usr/bin/ruby1.8
  --with-netscape
  --without-netscape
  --without-netscape
  --with-openldap1
  --without-openldap1
  --without-openldap1
  --with-openldap2
  --without-openldap2
  --without-openldap2
  --with-wldap32
  --without-wldap32
  --without-wldap32
  --with-ldap-dir
  --without-ldap-dir
  --with-ldap-include
  --without-ldap-include=${ldap-dir}/include
  --with-ldap-lib
  --without-ldap-lib=${ldap-dir}/lib
  --with-ldap-dir
  --without-ldap-dir
  --without-ldap-dir
  --with-ldap
  --without-ldap
  --without-ldap
  --with-libresolv
  --without-libresolv
  --without-libresolv
  --with-libcrypto
  --without-libcrypto
  --without-libcrypto
  --with-libssl
  --without-libssl
  --without-libssl
  --with-libpthread
  --without-libpthread
  --without-libpthread
  --with-libnsl
  --without-libnsl
  --without-libnsl
  --with-liblber
  --without-liblber
  --without-liblber
  --with-libldap_r
  --without-libldap_r
  --without-libldap_r
  --with-libldap
  --without-libldap
  --without-libldap
can't find ldap.h and lber.h
use the option '--with-ldap-dir'!

Gem files will remain installed in
/usr/lib/ruby/gems/1.8/gems/ruby-ldap-0.9.9 for inspection.
Results logged to
/usr/lib/ruby/gems/1.8/gems/ruby-ldap-0.9.9/gem_make.out

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