aptitude search ^postgres~ndev
i   postgresql-server-dev-9.1                                                   - development files for PostgreSQL 9.1 server-side programming
p   postgresql-server-dev-all                                                   - extension build tool for multiple PostgreSQL versions

You should install -dev files.

2012/11/4 D'Arcy J.M. Cain <darcy@vex.net>

On Sun, 04 Nov 2012 06:32:27 -0500
David | StyleFlare <david@styleflare.com> wrote:
> I get this error message.
>
> checking whether to include odbc... no
> checking for pg_config... /usr/local/pgsql/bin/pg_config
> checking for PostgreSQL libraries... checking for PQgetvalue in
> -lpq... no configure: error: no usable libpq; please install
> PostgreSQL devel package or equivalent
> ...
> Any ideas where I am going wrong?

You don't say whether PostgreSQL is installed or not.  Is it?  This
message implies that it is not.

--
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:darcy@Vex.Net

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