On my Red Hat system, the library in question ("libpq.a") is located in
the "/usr/lib" directory. It's in the same directory on a machine with
a Slackware distro. You could assume that it can be found in the
"/usr/lib" directory, but whenever I look for something on a Linux box I
like to use the "locate" command. For example, "locate libpq" returns a
list of filenames that contain the string "libpq". The list may be
considerable, so you might want to pipe the output through your favorite
paging program (I use "less").
As far as where you might get it if it doesn't exist:
The PostgreSQL rpms that I have on my system are as follows:
I'm not certain which one the libpq.a is actually resident in, but if I
had to hazard a guess I'd pick the "devel" rpm. Check to see which
rpm's are installed. I generated my list by running "rpm -qa | grep
postgres". Your PostgreSQL version might be different from mine - I'm
running version 7.0.3 - I don't know which version is included on the
Red Hat 7.2 distribution. All of the relevant RPMs should be on your
distribution CDs somewhere.
Hope this helps.
> Thanks. I assume this means I should have a file on my system named libpq. If so, I can't find it. Where should it be located? If I don't have it, where can I get it? Is there an rpm somewhere that has development libraries? I have checked out the rpms on my redhat cd's and I can't find it there either.
> Also, should my command look like this?
> gcc -Wall -o test1 test1.c -lpq
> I have the include file. It is in /usr/include/pgsql/libpq-fe.h.
> Thanks again.
> Andrew Pierce
> ---------- Original Message ----------------------------------
> From: John Burski <John(dot)Burski(at)911ep(dot)com>
> Date: Mon, 12 Nov 2001 11:53:56 -0600
>> Looks like you're missing the "-lpq" linker reference.
>> Also, don't forget to include the "/usr/include/pgsql/libpq-fe.h" file
>> in your source. (You know the drill ... #include <pgsql/libpq-fe.h> )
>> Check out the Programmer docs closely, they helped me a lot.
>> Best regards,
>> amp wrote:
>>> I have a new linux system running RedHat 7.2. The Postgreqsl installation I have is the one that came with RH. I downloaded all the pdfs for Administration, Programmer, Tutorial, etc. I am trying to write a simple C program to use the database I just created. My command line looks like this:
>>> gcc -Wall -o test1 test1.c
>>> >From this, I get a long list of 'Undefined Reference' errors for any function that starts with 'PQ'.
>>> I assume I am missing a library or something. I am new to Linux programming (although I am an experienced C/C++ programmer under windows).
>>> What am I missing? Thanks in advance.
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