pairprog@pairprog06:~$ export IBM_DB_DIR=/home/db2inst1/sqllib
pairprog@pairprog06:~$ export IBM_DB_LIB=/home/db2inst1/sqllib/lib

pairprog@pairprog06:~$ sudo gem install ibm_db
Building native extensions.  This could take a while...
ERROR:  Error installing ibm_db:
	ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb install ibm_db
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=/usr/bin/ruby1.8
	--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
/usr/lib/ruby/1.8/mkmf.rb:623:in `find_library': private method `split' called for nil:NilClass (NoMethodError)
	from /usr/lib/ruby/1.8/mkmf.rb:623:in `collect'
	from /usr/lib/ruby/1.8/mkmf.rb:623:in `find_library'
	from extconf.rb:23


Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/ibm_db-1.0.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/ibm_db-1.0.0/ext/gem_make.out