No library found for -lpq

Dear pgsql_perl5-experts!

I tried to install pgsql_perl5 1.9.0 on WINDOWS XP following the README
file, but I still have serious problems.

Because I found no possibility to compile postgresql from the source files
(MS VC++ Toolkit 2003 is no longer available and Microsoft Visaul C++ 2005
Express Edition gives errors), I installed directly the complete windows
version of PostgreSQL 8.1.4 including all the development tools. ActivePerl
5.8.8.817 is already installed, also nmake and DBI 1.50.

Because in my installation of PostgreSQL I didn't find libpq.so, I
downloaded postgresql-8.1.4-1-binaries-no-installer.zip, unzipped it to a
temporary directory ...\postgresql-8.1.4-1-binaries-no-installer (...\ is
some temporary path). But there I found only a libpq.dll instead. Then I
set the variables as follows:
POSTGRES_INCLUDE=...\postgresql-8.1.4-1-binaries-no-installer\include
POSTGRES_LIB=...\postgresql-8.1.4-1-binaries-no-installer\lib

I changed to ...\pgsql_perl5-1.9.0 and called perl Makefile.PL resulting in
the error message: "Note (probably harmless): No library found for -lpq"

Ignoring this I tried to call nmake, but this ended in a fatal error,
because the linker could not resolve some extern symbols.

Surfing through the net I found answers to that problem like "there is
missing the library libpq, that is part of the postgres installation".
Sarching for files like that I found libpq-fe.h, libpq.a, and libpq.dll in
my paths POSTGRES_INCLUDE and POSTGRES_LIB respectively, but no libpq.so.

Can you tell me what's going wrong? Are there missing files (e.g. libpq.so)
or environment variables? And in case of missing files: where can I get
them? Furthermore I couldn't find any extra development-package for
postgresql.

Best regards
i. A. Wolfgang Wening

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