#1147481 alicevision: FTBFS with OpenCV 5.0

Package:
src:alicevision
Source:
src:alicevision
Submitter:
Aron Xu
Date:
2026-09-12 09:05:03 UTC
Severity:
normal
Tags:
#1147481#5
Date:
2026-09-12 09:03:19 UTC
From:
To:
Dear maintainer,

Your package fails to build from source against opencv 5.0.0+dfsg-1~exp1,
currently in experimental.

OpenCV 5.0 renames its entire install tree from opencv4 to opencv5 and ships
no compatibility shims:

  * pkg-config: only /usr/lib/<triplet>/pkgconfig/opencv5.pc.  There is no
                opencv4.pc and no opencv.pc.
  * headers:    /usr/include/opencv5/opencv2/..., no /usr/include/opencv4.
  * cmake:      /usr/lib/<triplet>/cmake/opencv5/OpenCVConfig.cmake.  A bare
                find_package(OpenCV) still resolves, but a pinned version
                such as find_package(OpenCV 4.7) no longer matches.
  * modules:    libopencv-calib3d-dev is split into libopencv-calib-dev,
                libopencv-geometry-dev, libopencv-stereo-dev and
                libopencv-ptcloud-dev; libopencv-features2d-dev becomes
                libopencv-features-dev.  The CMake component names change
                with them (features2d -> features).
  * geometry:   the new geometry module is not only a piece of calib3d.  It
                also absorbs shape and contour functions that used to live
                in imgproc -- contourArea, arcLength, approxPolyDP,
                boundingRect, minAreaRect, convexHull and
                getPerspectiveTransform among them -- and opencv2/opencv.hpp
                does not pull in opencv2/geometry.hpp, so code that reached
                those through the umbrella header now needs an explicit
                include of opencv2/geometry.hpp.

alicevision fails because src/CMakeLists.txt:548 calls find_package(OpenCV
...) requesting the features2d component, and CMake reports "Could NOT
find OpenCV (missing: features2d) (found version "5.0.0")", so
OpenCV_FOUND stays FALSE even though OpenCVConfig.cmake was located under
/usr/lib/x86_64-linux-gnu/cmake/opencv5. The guard at
src/CMakeLists.txt:564 then aborts configure with "Failed to find
OpenCV." The maintainer should change the component name in that
find_package(OpenCV COMPONENTS ...) call from features2d to features, the
name OpenCV 5.0 exports for the component now shipped by
libopencv-features-dev.

The same source builds fine in the same chroot against the OpenCV 4.10
packages currently in unstable, so this is specific to OpenCV 5.

The relevant part of the build log follows; the full log is attached.