- Add libpoppler-dev and libpoppler-qt6-dev to APT_PACKAGES in new_docker_build.sh - Fix QT6_GUI_AVAILABLE detection logic: check OpenGL_FOUND before setting TRUE - Add test_nglpdfwidget to RELEASE_GROUP3_TARGETS for explicit build - Use unique Docker image name: legatus-qt6-prebuilt:latest Test result: test_nglpdfwidget now builds and passes CTest (0.07 sec) Release build: 4/7 tests pass (57%), 3 tests excluded as expected Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>