On Sun, 02 Aug 2020 10:50:48 +0200
Guillaume Le Vaillant <glv@posteo.net> wrote:

> When trying to build the opencv package , I get the following error:
> 
> --8<---------------cut here---------------start------------->8---
[..]
> error: lvalue required as unary ‘&’ operand jas_seqent_t* pix_row =
> &jas_matrix_get( buffer, y / ystep, 0 );

I have a patch based on this not yet released commit:

From f66fc199a20882c546fa31142e9c0f5a8b3cf983 Mon Sep 17 00:00:00 2001
From: Florian Jung <flo@windfis.ch>
Date: Wed, 29 Jul 2020 18:51:55 +0200
Subject: [PATCH] Fix build of grfmt_jpeg2000.cpp

The first round was successful, now the second run of --rounds=2 is
compiling/testing. Give me some days to clean it up and to update to the
latest 3.x release. Note: I stay with the 3.x branch as updating to 4.x
is more complicated: We need to check compatibility with existing
dependencies and there is a lot of new code which needs to be checked
for license issues.

Björn