Attempt to upgrade the ibm_db gem from v2.5.7 to v2.5.9 on a Mac with IBM DB2 Client v9.5.2

ibm_db upgrade

Installing ibm_db (2.5.9) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/marius/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 
creating gil_release_version
creating unicode_support_version
checking for SQLConnect() in -ldb2... no
checking for SQLConnect() in -ldb2... 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=/Users/marius/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
	--with-IBM_DB-dir
	--without-IBM_DB-dir
	--with-IBM_DB-include
	--without-IBM_DB-include=${IBM_DB-dir}/include
	--with-IBM_DB-lib
	--without-IBM_DB-lib=${IBM_DB-dir}/lib
	--with-db2lib
	--without-db2lib
	--with-db2lib
	--without-db2lib
 extconf failure: Unable to locate DB2 libraries.

Follow the steps below and retry

Step 1: - Install IBM DB2 Universal Database Server/Client

step 2: - Set the environment variables IBM_DB_INCLUDE and IBM_DB_LIB as below 
        
             (assuming bash shell)
        
             export IBM_DB_INCLUDE=DB2HOME/include (eg. /home/db2inst1/sqllib/include or /opt/ibm/db2/v9.5/include)
             export IBM_DB_LIB=DB2HOME/lib     (eg. /home/db2inst1/sqllib/lib or /opt/ibm/db2/V9.5/lib32)

step 3: - Retry gem install
        



Gem files will remain installed in /Users/marius/.rvm/gems/ruby-1.9.2-p290@IMCloud/gems/ibm_db-2.5.9 for inspection.
Results logged to /Users/marius/.rvm/gems/ruby-1.9.2-p290@IMCloud/gems/ibm_db-2.5.9/ext/gem_make.out
An error occured while installing ibm_db (2.5.9), and Bundler cannot continue.
Make sure that `gem install ibm_db -v '2.5.9'` succeeds before bundling.