Local modification: ENC reference is decoded once after owner/reactors/extension,
before layer. Reader only; no DWG encoder enabled. Upstream license GPL-3.0-or-later
and notices retained. This package does not assign a license to the surrounding app.

Reproducible build inputs: Windows x64, w64devkit 2.10.0 GCC 16.2.0,
CMake 4.1 (minimum 3.20), generated Win64 config.h included.
IS_RELEASE undefined to preserve invalid-number detection; strict aliasing disabled.
Add w64devkit/bin to PATH, then from this extracted folder:
cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_C_COMPILER=gcc.exe -DCMAKE_BUILD_TYPE=Release
cmake --build build -j 2
Executable: build/dwgread.exe. Requires only standard Windows KERNEL32 and msvcrt.
Compiler: https://github.com/skeeto/w64devkit/releases/tag/v2.10.0
Compiler archive SHA256: 18d0a4c71a166f8401ab6305781bec5882b40b5e06ba9807c61cb5f3b3c6325e
