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The msys2 CI job mixed a pinned system OpenCV 4.13 (via pkg-config) with the Apothecary-bundled libopencv_world.a, whose objects reference cv::g_Saturate8u / cv::g_8x32fTab as DLL imports with no DLL present, failing the allAddonsExample link with undefined symbols. Use exactly one OpenCV on msys2: the Apothecary-built OpenCV 4 static libraries bundled under addons/ofxOpenCv/libs/opencv, mirroring how the Android and Emscripten sections already work. - addons/ofxOpenCv/addon_config.mk: msys2 section lists the bundled static archives explicitly instead of pkg-config opencv4, and no longer excludes the bundled headers/libs - scripts/msys2/install_dependencies.sh: remove the pinned pacman OpenCV install, the 5.x fallback, and the addon_config.mk pkg-config rewrite Requires an Apothecary msys2 opencv4 package whose libopencv_world.a actually defines the core data tables (the 2026-09-28 package's world archive only carries .refptr imports for them and cannot link).
The Apothecary package lays its static archives out per architecture (lib/msys2/x86_64, lib/msys2/aarch64, ...). % is expanded to a glob by the makefile addon parser (and understood by the Project Generator), so match whichever arch directory the installed package ships instead of hardcoding x86_64.
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Link the Apothecary-built OpenCV 4 static libraries on msys2 instead of the pacman opencv package.
Requires an Apothecary msys2 opencv4 package whose libopencv_world.a defines the core data tables.