Ikegami, I'm unsure how you added it to the path. Here is my new output, where I've been getting the similar error. (btw, you are very helpful) 
C:\Documents and Settings\vol7ron>cpan
Set up gcc environment - 3.4.5 (mingw-vista special r3)

cpan shell -- CPAN exploration and modules installation (v1.9402)
Enter 'h' for help.

cpan> install DBD::Pg
Going to read 'C:\Program-Files\Perl\cpan\Metadata'
  Database was generated on Sat, 05 Sep 2009 09:26:59 GMT
Running install for module 'DBD::Pg'
Running make for T/TU/TURNSTEP/DBD-Pg-2.15.1.tar.gz
Checksum for C:\Program-Files\Perl\cpan\sources\authors\id\T\TU\TURNST
+EP\DBD-Pg-2.15.1.tar.gz ok
Scanning cache C:\Program-Files\Perl/cpan/build for sizes
......................................................................
+......DONE
DBD-Pg-2.15.1/
DBD-Pg-2.15.1/quote.h
DBD-Pg-2.15.1/.perlcriticrc
DBD-Pg-2.15.1/TODO
DBD-Pg-2.15.1/README
DBD-Pg-2.15.1/types.c
DBD-Pg-2.15.1/Changes
DBD-Pg-2.15.1/Makefile.PL
DBD-Pg-2.15.1/t/
DBD-Pg-2.15.1/t/00basic.t
DBD-Pg-2.15.1/t/08async.t
DBD-Pg-2.15.1/t/01constants.t
DBD-Pg-2.15.1/t/03smethod.t
DBD-Pg-2.15.1/t/01connect.t
DBD-Pg-2.15.1/t/03dbmethod.t
DBD-Pg-2.15.1/t/06bytea.t
DBD-Pg-2.15.1/t/02attribs.t
DBD-Pg-2.15.1/t/04misc.t
DBD-Pg-2.15.1/t/lib/
DBD-Pg-2.15.1/t/lib/App/
DBD-Pg-2.15.1/t/lib/App/Info.pm
DBD-Pg-2.15.1/t/lib/App/Info/
DBD-Pg-2.15.1/t/lib/App/Info/RDBMS/
DBD-Pg-2.15.1/t/lib/App/Info/RDBMS/PostgreSQL.pm
DBD-Pg-2.15.1/t/lib/App/Info/Util.pm
DBD-Pg-2.15.1/t/lib/App/Info/Request.pm
DBD-Pg-2.15.1/t/lib/App/Info/Handler.pm
DBD-Pg-2.15.1/t/lib/App/Info/Handler/
DBD-Pg-2.15.1/t/lib/App/Info/Handler/Prompt.pm
DBD-Pg-2.15.1/t/lib/App/Info/RDBMS.pm
DBD-Pg-2.15.1/t/dbdpg_test_setup.pl
DBD-Pg-2.15.1/t/20savepoints.t
DBD-Pg-2.15.1/t/07copy.t
DBD-Pg-2.15.1/t/09arrays.t
DBD-Pg-2.15.1/t/00-signature.t
DBD-Pg-2.15.1/t/12placeholders.t
DBD-Pg-2.15.1/t/99cleanup.t
DBD-Pg-2.15.1/dbivport.h
DBD-Pg-2.15.1/Pg.h
DBD-Pg-2.15.1/dbdimp.c
DBD-Pg-2.15.1/quote.c
DBD-Pg-2.15.1/META.yml
DBD-Pg-2.15.1/lib/
DBD-Pg-2.15.1/lib/Bundle/
DBD-Pg-2.15.1/lib/Bundle/DBD/
DBD-Pg-2.15.1/lib/Bundle/DBD/Pg.pm
DBD-Pg-2.15.1/Pg.xs
DBD-Pg-2.15.1/README.win32
DBD-Pg-2.15.1/win32.mak
DBD-Pg-2.15.1/MANIFEST
DBD-Pg-2.15.1/SIGNATURE
DBD-Pg-2.15.1/Pg.pm
DBD-Pg-2.15.1/MANIFEST.SKIP
DBD-Pg-2.15.1/README.dev
DBD-Pg-2.15.1/dbdimp.h
DBD-Pg-2.15.1/types.h

  CPAN.pm: Going to build T/TU/TURNSTEP/DBD-Pg-2.15.1.tar.gz

Set up gcc environment - 3.4.5 (mingw-vista special r3)
Configuring DBD::Pg 2.15.1
Path to pg_config? C:\Program-Files\PostgreSQL\8.4\bin\pg_config.exe
PostgreSQL version: 80400 (default port: 5432)
POSTGRES_HOME: (not set)
POSTGRES_INCLUDE: C:/PROGRA~2/POSTGR~1/8.4/include
POSTGRES_LIB: C:/PROGRA~2/POSTGR~1/8.4/lib
OS: MSWin32
Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -lpq
Using DBI 1.607 (for perl 5.010001 on MSWin32-x86-multi-thread) instal
+led in C:/Program-Files/Perl/lib/auto/DBI/
Writing Makefile for DBD::Pg

==========================================================

WARNING! No libpq libraries were detected!

You need to install the postgresql-libs package for your system,

or set the POSTGRES_LIB environment variable to the correct place.

Removing (Makefile)

===========================================================

Warning: No success on command[C:\Program-Files\Perl\bin\perl.exe Make
+file.PL INSTALLDIRS=site]
  TURNSTEP/DBD-Pg-2.15.1.tar.gz
  C:\Program-Files\Perl\bin\perl.exe Makefile.PL INSTALLDIRS=site -- N
+OT OK
Running make test
  Make had some problems, won't test
Running make install
  Make had some problems, won't install
Failed during this command:
 TURNSTEP/DBD-Pg-2.15.1.tar.gz                : writemakefile NO 'C:\P
+rogram-Files\Perl\bin\perl.exe Makefile.PL INSTALLDIRS=site' returned
+ status 256


cpan>

[download]
Could you please state how you added it to the path?
I am using "C:\Program-Files\" instead of "C:\Program Files\", so C:/Progra~2/ should be correct. In PostgreSQL\8.4\ there is a "lib" directory and I made sure all the .dll's are listed in there.

In reply to Re^4: Installing DBD::Pg on Windows XP Pro 32b by deMize
in thread Installing DBD::Pg on Windows XP Pro 32b by deMize

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