From 0a1e7ea57ebe448fd3f9f6941567f3784833e1ac Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Tue, 14 Apr 2026 10:26:29 -0500
Subject: [PATCH] Build wgrib2 with PNG + AEC decoders
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Prod wgrib2 3.6.0 was built without PNG support (cmake had no
-DUSE_PNG flag) so MrmsFetchWorker crashed on every tick with
'packing type 41 not supported' — MRMS PrecipRate tiles are
PNG-compressed (GRIB2 DRT 5.41). libpng-dev was already in the
builder stage; the cmake invocation just never asked wgrib2 to
use it.

Also turn on -DUSE_AEC=ON since libaec-dev is already installed
and some HRRR native-grid variables ship with AEC/CCSDS 121
compression.
---
 Dockerfile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Dockerfile b/Dockerfile
index 9390dcf5..d457af6d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -37,6 +37,7 @@ RUN wget -q --content-disposition "https://github.com/NOAA-EMC/wgrib2/archive/re
   && cd wgrib2-${WGRIB2_VERSION} \
   && mkdir build && cd build \
   && cmake .. -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release \
+       -DUSE_PNG=ON -DUSE_AEC=ON \
   && make -j$(nproc) \
   && make install \
   && strip /usr/local/bin/wgrib2