which version of postgresql you are using?
bmaxa@Branimirs-Air ~ % brew search postgres
==> Formulae
check_postgres              postgresql@10               postgresql@12               postgresql@9.5              postgrest                   postgis
postgresql                  postgresql@11               postgresql@9.4              postgresql@9.6              qt-postgresql
==> Casks
navicat-for-postgresql                     postgres-unofficial                        postgrespreferencepane                     sqlpro-for-postgres

?

Greetings, Branimir.

On 21.09.2021., at 22:47, Geraldus <heraldhoi@gmail.com> wrote:

Hi, dear Cafe!

I'm having trouble compiling an application which uses PostgreSQL on a macbook with an M1 chip.  

Postgre itself seems to work fine.  It is installed via `homebrew` (if I'm not mistaken this is the only way on Mac to get pg_config, which is required for `persistent-postgresql`).  The error message is following: 

```
persistent-postgresql> <command line>: dlopen(/Users/arthurfayzrakhmanov/.stack/snapshots/x86_64-osx/36432054bd8d13c1da6134758733286b536c65d34222dcf10ecb29bd437c8117/8.10.7/lib/x86_64-osx-ghc-8.10.7/libHSpostgresql-libpq-0.9.4.3-GrxZELytXmSAOH6lAioiw9-ghc8.10.7.dylib, 5): Symbol not found: _PQclear
persistent-postgresql>   Referenced from: /Users/arthurfayzrakhmanov/.stack/snapshots/x86_64-osx/36432054bd8d13c1da6134758733286b536c65d34222dcf10ecb29bd437c8117/8.10.7/lib/x86_64-osx-ghc-8.10.7/libHSpostgresql-libpq-0.9.4.3-GrxZELytXmSAOH6lAioiw9-ghc8.10.7.dylib
persistent-postgresql>   Expected in: flat namespace
persistent-postgresql>  in /Users/arthurfayzrakhmanov/.stack/snapshots/x86_64-osx/36432054bd8d13c1da6134758733286b536c65d34222dcf10ecb29bd437c8117/8.10.7/lib/x86_64-osx-ghc-8.10.7/libHSpostgresql-libpq-0.9.4.3-GrxZELytXmSAOH6lAioiw9-ghc8.10.7.dylib
```

The minimal setup to reproduce is following: 

```
dependencies:
- base >= 4.7 && < 5
- persistent >= 2.13.1.2 && < 3
- persistent-postgresql >= 2.13.1.0 && < 3
```

Digging around gave me just a few clues.  It seems that `libpq` I have is compiled some other way it expected, and missing some symbols required `persistent-postgresql` to work.  I believe this is not a bug, rather that a local configuration issue.  

Does anyone know which is right setup to build persistent-postgresql on Macs with M1 chip? Thanks in advance.

Sincerely.  
Arthur.

P.S. Please apologize if this is not a right place to ask such questions.  Asked already in Yesod Google Groups and Stack Overflow.  But didn't received any feedback.
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