PostgreSQL create extension mongo_fdw

Question

I want to connect a PostgreSQL database with a MongoDB by using Mongo_fdw. After following this instruction to install mongo_fdw with the autogen.sh script on Ubuntu 22.04 LTS, I wanted to check the connection and ran CREATE EXTENSION mongo_fdw; in my database, but the following error occured:

ERROR: could not access file "$libdir/mongo_fdw": No such file or directory

Searchig for a solution I found this page on GitHub, where the same error is discussed. Following the recommendations there, I checked pg_config --version , pg_config --libdir and pg_config --sharedir with the following results:

$ pg_config --version
PostgreSQL 12.9
$ pg_config --libdir
/home/qgis/anaconda3/lib
$ pg_config --sharedir
/home/qgis/anaconda3/share

When I check /home/qgis/anaconda3/share/extension I get the following files:

drwxrwxr-x  2 qgis qgis 4096 Feb  1 10:58 ./
drwxrwxr-x 32 qgis qgis 4096 Jan 18 10:28 ../
-rw-r--r--  1 root root  157 Feb  1 10:58 mongo_fdw--1.0--1.1.sql
-rw-r--r--  1 root root  593 Feb  1 10:58 mongo_fdw--1.0.sql
-rw-r--r--  1 root root  709 Feb  1 10:58 mongo_fdw--1.1.sql
-rw-r--r--  1 root root  274 Feb  1 10:58 mongo_fdw.control
-rw-rw-r--  2 qgis qgis  310 Jun 24  2022 plpgsql--1.0.sql
-rw-rw-r--  2 qgis qgis  179 Jun 24  2022 plpgsql.control
-rw-rw-r--  2 qgis qgis  370 Jun 24  2022 plpgsql--unpackaged--1.0.sql

I also ran ldconfig as it is recommended on the GitHub page but with no results.

Does someone has an idea how to solve this error?

Thanks in advance!

Answer 1

You have to specify the correct pg_config when building the software, probably

make PG_CONFIG=/usr/lib/postgresql/14/bin/pg_config

That file should exist if you installed the package with the C headers, which is typically called "devel" or "dev" or similar.