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From: Jim Morcombe <jim@seekchrist.org>
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Subject: A problem with libpq
Date: Tue, 08 Feb 2005 11:08:19 +0800
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Can anyone help me with this problem?

I have installed postgresql-7.2.1 and am trying to compile one of the 
test programs from the directory src/test/examples.

I have compiled the example successfully on my Red Hat Linux machine and 
now need to compile it on my SCO machine but keep getting errors that 
seem to mean that I have forgotten to use the "-lpq" option when 
compiling.  I am running an old version of SCO Openserver 5

I am using the following command:

  cc testlibpq.c -I/usr/local/pgsql/include -L/usr/local/pgsql/lib -lpq 
-otestlibpq

I receive the following error messages:

undefined                       first referenced
  symbol                             in file
PQfinish                            testlibpq.o
PQsetdbLogin                        testlibpq.o
PQstatus                            testlibpq.o
PQerrorMessage                      testlibpq.o
PQexec                              testlibpq.o
PQresultStatus                      testlibpq.o
PQclear                             testlibpq.o
PQnfields                           testlibpq.o
PQfname                             testlibpq.o
PQgetvalue                          testlibpq.o
PQntuples                           testlibpq.o
ld fatal: Symbol referencing errors. No output written to testlibpq

As far as I can see (and I am unfamiliar with libraries, etc) 
/usr/local/pgsql/lib seems okay.  It has the following files in it:

-rw-r--r--   1 root     sys        79756 Jul 30  2002 libpq.a
-rwxr-xr-x   1 root     sys        67600 Jul 30  2002 libpq.so@
-rwxr-xr-x   1 root     sys        67600 Jul 30  2002 libpq.so.2@
-rwxr-xr-x   1 root     sys        67600 Jul 30  2002 libpq.so.2.2

In my ignorance, I take it that libpq.so.2.2 is the real file and that 
libpq.so is simply a link to it.