Bug#1147482: auto-multiple-choice: FTBFS with OpenCV 5.0

Aron Xu aron at debian.org
Sat Sep 12 10:04:41 BST 2026 

Source: auto-multiple-choice
Version: 1.7.0-4
Severity: important
Tags: ftbfs
User: opencv at packages.debian.org
Usertags: opencv5-transition
Control: affects -1 src:opencv
X-Debbugs-Cc: opencv at packages.debian.org, aron at debian.org

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.

In auto-multiple-choice's case the build hardcodes the OpenCV 4 include
directory. The command that builds AMC-detect ends with
"-I /usr/include/opencv4 -lopencv_core -lopencv_imgproc
-lopencv_imgcodecs", and that directory does not exist under OpenCV 5,
whose headers live in /usr/include/opencv5. With no usable include path
AMC-detect.cc:40 and AMC-buildpdf.cc fail at "fatal error:
opencv2/core/core.hpp: No such file or directory", aborting the Makefile
targets AMC-detect (Makefile:134) and AMC-buildpdf (Makefile:137). The
missing header is a symptom of the wrong -I, not of a header that went
away. Replacing the hardcoded path and library list with a pkg-config
query, e.g. $(shell pkg-config --cflags --libs opencv5), would make the
build follow the install tree instead of pinning a version-specific path.

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.

  gcc -o AMC-detect AMC-detect.cc -Wdate-time -D_FORTIFY_SOURCE=2 -g
-O2 -ffile-prefix-map=/build/reproducible-path/auto-multiple-choice-1.7.0=.
-fstack-protector-strong -fstack-clash-protection -Wformat
-Werror=format-security -fcf-protection -Wl,-z,relro -Wl,-z,now
-lstdc++ -lm -I /usr/include/open [...]
  gcc -o AMC-buildpdf AMC-buildpdf.cc -Wdate-time -D_FORTIFY_SOURCE=2
-g -O2 -ffile-prefix-map=/build/reproducible-path/auto-multiple-choice-1.7.0=.
-fstack-protector-strong -fstack-clash-protection -Wformat
-Werror=format-security -fcf-protection -Wl,-z,relro -Wl,-z,now
-lstdc++ -lm -I/usr/include/p [...]
  gcc -o AMC-pdfformfields pdfformfields.c -Wdate-time
-D_FORTIFY_SOURCE=2 -g -O2 -Werror=implicit-function-declaration
-ffile-prefix-map=/build/reproducible-path/auto-multiple-choice-1.7.0=.
-fstack-protector-strong -fstack-clash-protection -Wformat
-Werror=format-security -fcf-protection -Wl,-z,relr [...]
  rsvg-convert -w 32 -h 32 icons/auto-multiple-choice.svg -o
icons/auto-multiple-choice.png
  gzip -n -k -S z icons/auto-multiple-choice.svg
  make -C doc
  make -C I18N
  rsvg-convert -a -w 16 -h 16 icons/auto-multiple-choice.svg -o
icons/auto-multiple-choice-16.png ;  rsvg-convert -a -w 22 -h 22
icons/auto-multiple-choice.svg -o icons/auto-multiple-choice-22.png ;
rsvg-convert -a -w 24 -h 24 icons/auto-multiple-choice.svg -o
icons/auto-multiple-choice-24.png ;  rsv [...]
  make[3]: Entering directory
'/build/reproducible-path/auto-multiple-choice-1.7.0/doc'
  rsvg-convert -f pdf img_src/important.svg -o img_pdf/important.pdf
  make[3]: Entering directory
'/build/reproducible-path/auto-multiple-choice-1.7.0/I18N'
  msgfmt lang/ar.po -o lang/ar.mo
  rsvg-convert -f pdf img_src/note.svg -o img_pdf/note.pdf
  msgfmt lang/ca.po -o lang/ca.mo
  rsvg-convert -f pdf img_src/warning.svg -o img_pdf/warning.pdf
  msgfmt lang/de.po -o lang/de.mo
  dblatex -P latex.encoding=utf8 -b xetex -t tex -p custom.xsl
--texstyle=amcdocstyle --xslt-opts="--nonet" --xslt-opts="--catalogs"
auto-multiple-choice.en.xml -o auto-multiple-choice.en.tex
  dblatex -P latex.encoding=utf8 -b xetex -t tex -p custom.xsl
--texstyle=amcdocstyle --xslt-opts="--nonet" --xslt-opts="--catalogs"
auto-multiple-choice.fr.xml -o auto-multiple-choice.fr.tex
  dblatex -P latex.encoding=utf8 -b xetex -t tex -p custom.xsl
--texstyle=amcdocstyle --xslt-opts="--nonet" --xslt-opts="--catalogs"
auto-multiple-choice.ja.xml -o auto-multiple-choice.ja.tex
  msgfmt lang/es.po -o lang/es.mo
  /usr/bin/env perl extrait-fichiers.pl --liste
auto-multiple-choice.en.ext auto-multiple-choice.en.xml
  msgfmt lang/fr.po -o lang/fr.mo
  xsltproc --nonet --catalogs --param man.charmap.use.subset "0"
--param make.year.ranges "1" --param make.single.year.ranges "1"
--param man.output.lang.in.name.enabled "1"
http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
auto-multiple-choice.en.xml
  rm -f html/auto-multiple-choice.en/*.html
  /usr/bin/env perl extrait-fichiers.pl --liste
auto-multiple-choice.fr.ext auto-multiple-choice.fr.xml
  msgfmt lang/ja.po -o lang/ja.mo
  xsltproc --nonet --catalogs --param man.charmap.use.subset "0"
--param make.year.ranges "1" --param make.single.year.ranges "1"
--param man.output.lang.in.name.enabled "1"
http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
auto-multiple-choice.fr.xml
  msgfmt lang/pt_BR.po -o lang/pt_BR.mo
  rm -f html/auto-multiple-choice.fr/*.html
  Variable $SGML_CATALOG_FILES not set
  pngtopnm icons/auto-multiple-choice.png | ppmtoxpm >
icons/auto-multiple-choice.xpm
  msgfmt lang/pt_PT.po -o lang/pt_PT.mo
  Variable $SGML_CATALOG_FILES not set
  msgfmt lang/ta.po -o lang/ta.mo
  ppmtoxpm: (Computing colormap...
  ppmtoxpm: ...Done.  32 colors found.)
  xsltproc --nonet --catalogs --stringparam base.dir
html/auto-multiple-choice.en/ doc-xhtml.xsl
auto-multiple-choice.en.xml
  /usr/bin/env perl extrait-fichiers.pl --liste
auto-multiple-choice.ja.ext auto-multiple-choice.ja.xml
  xsltproc --nonet --catalogs --param man.charmap.use.subset "0"
--param make.year.ranges "1" --param make.single.year.ranges "1"
--param man.output.lang.in.name.enabled "1"
http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
auto-multiple-choice.ja.xml
  rm -f html/auto-multiple-choice.ja/*.html
  rsvg-convert -w 24 -h 24 img_src/important.svg -o html/images/important.png
  Variable $SGML_CATALOG_FILES not set
  rsvg-convert -w 24 -h 24 img_src/note.svg -o html/images/note.png
  rsvg-convert -w 24 -h 24 img_src/warning.svg -o html/images/warning.png
  xsltproc --nonet --catalogs --stringparam base.dir
html/auto-multiple-choice.fr/ doc-xhtml.xsl
auto-multiple-choice.fr.xml
  rsvg-convert -w 12 -h 12 img_src/callouts/1.svg -o html/images/callouts/1.png
  Variable $SGML_CATALOG_FILES not set
  rsvg-convert -w 12 -h 12 img_src/callouts/10.svg -o
html/images/callouts/10.png
  xsltproc --nonet --catalogs --stringparam base.dir
html/auto-multiple-choice.ja/ doc-xhtml.xsl
auto-multiple-choice.ja.xml
  rsvg-convert -w 12 -h 12 img_src/callouts/11.svg -o
html/images/callouts/11.png
  Variable $SGML_CATALOG_FILES not set
  rsvg-convert -w 12 -h 12 img_src/callouts/12.svg -o
html/images/callouts/12.png
  rsvg-convert -w 12 -h 12 img_src/callouts/13.svg -o
html/images/callouts/13.png
  Variable $SGML_CATALOG_FILES not set
  rsvg-convert -w 12 -h 12 img_src/callouts/14.svg -o
html/images/callouts/14.png
  rsvg-convert -w 12 -h 12 img_src/callouts/15.svg -o
html/images/callouts/15.png
  rsvg-convert -w 12 -h 12 img_src/callouts/2.svg -o html/images/callouts/2.png
  rsvg-convert -w 12 -h 12 img_src/callouts/3.svg -o html/images/callouts/3.png
  rsvg-convert -w 12 -h 12 img_src/callouts/4.svg -o html/images/callouts/4.png
  rsvg-convert -w 12 -h 12 img_src/callouts/5.svg -o html/images/callouts/5.png
  rsvg-convert -w 12 -h 12 img_src/callouts/6.svg -o html/images/callouts/6.png
  rsvg-convert -w 12 -h 12 img_src/callouts/7.svg -o html/images/callouts/7.png
  rsvg-convert -w 12 -h 12 img_src/callouts/8.svg -o html/images/callouts/8.png
  rsvg-convert -w 12 -h 12 img_src/callouts/9.svg -o html/images/callouts/9.png
  find modeles/ar/groups.d -type d -exec chmod 0755 '{}' \;
  find modeles/ar/scoring.d -type d -exec chmod 0755 '{}' \;
  AMC-detect.cc:40:10: fatal error: opencv2/core/core.hpp: No such
file or directory
     40 | #include "opencv2/core/core.hpp"
        |          ^~~~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  find modeles/ar/groups.d -type f -exec chmod 0644 '{}' \;
  make[2]: *** [Makefile:134: AMC-detect] Error 1
  make[2]: *** Waiting for unfinished jobs....
  find modeles/ar/scoring.d -type f -exec chmod 0644 '{}' \;
  tar cn -C modeles/ar/groups.d --sort=name --owner=root --group=root
--numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/ar/groups.tgz
  find modeles/ar/separate.d -type d -exec chmod 0755 '{}' \;
  find modeles/ar/simple.d -type d -exec chmod 0755 '{}' \;
  find modeles/en/Nominative-sheets-separateanswersheet.d -type d
-exec chmod 0755 '{}' \;
  find modeles/en/Nominative-sheets.d -type d -exec chmod 0755 '{}' \;
  find modeles/en/topics-latex.d -type d -exec chmod 0755 '{}' \;
  find modeles/fr/Pre-remplies-ensemble.d -type d -exec chmod 0755 '{}' \;
  find modeles/fr/Pre-remplies.d -type d -exec chmod 0755 '{}' \;
  find modeles/ar/separate.d -type f -exec chmod 0644 '{}' \;
  find modeles/ar/simple.d -type f -exec chmod 0644 '{}' \;
  find modeles/en/Nominative-sheets-separateanswersheet.d -type f
-exec chmod 0644 '{}' \;
  find modeles/en/Nominative-sheets.d -type f -exec chmod 0644 '{}' \;
  tar cn -C modeles/ar/scoring.d --sort=name --owner=root --group=root
--numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/ar/scoring.tgz
  find modeles/en/topics-latex.d -type f -exec chmod 0644 '{}' \;
  find modeles/fr/topics-latex.d -type d -exec chmod 0755 '{}' \;
  find modeles/fr/Pre-remplies-ensemble.d -type f -exec chmod 0644 '{}' \;
  find modeles/fr/Pre-remplies.d -type f -exec chmod 0644 '{}' \;
  find modeles/fr/topics-latex.d -type f -exec chmod 0644 '{}' \;
  make[3]: Leaving directory
'/build/reproducible-path/auto-multiple-choice-1.7.0/I18N'
  find modeles/other/survey.d -type d -exec chmod 0755 '{}' \;
  /usr/bin/env perl ./index.pl auto-multiple-choice.en
auto-multiple-choice.fr auto-multiple-choice.ja > html/index.html
  tar cn -C modeles/ar/separate.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/ar/separate.tgz
  tar cn -C modeles/ar/simple.d --sort=name --owner=root --group=root
--numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/ar/simple.tgz
  find modeles/other/survey.d -type f -exec chmod 0644 '{}' \;
  tar cn -C modeles/en/Nominative-sheets-separateanswersheet.d
--sort=name --owner=root --group=root --numeric-owner
--mtime=@1451602800 -O . | gzip -n -c >
modeles/en/Nominative-sheets-separateanswersheet.tgz
  tar cn -C modeles/en/Nominative-sheets.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/en/Nominative-sheets.tgz
  tar cn -C modeles/en/topics-latex.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/en/topics-latex.tgz
  tar cn -C modeles/fr/Pre-remplies-ensemble.d --sort=name
--owner=root --group=root --numeric-owner --mtime=@1451602800 -O . |
gzip -n -c > modeles/fr/Pre-remplies-ensemble.tgz
  tar cn -C modeles/fr/Pre-remplies.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/fr/Pre-remplies.tgz
  tar cn -C modeles/fr/topics-latex.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/fr/topics-latex.tgz
  tar cn -C modeles/other/survey.d --sort=name --owner=root
--group=root --numeric-owner --mtime=@1451602800 -O . | gzip -n -c >
modeles/other/survey.tgz
  Warn: AUTHOR sect.: no personblurb|contrib for Alexis Bienvenüe
  Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr
  Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso
  Warn: AUTHOR sect.: no personblurb|contrib for Frédéric Bréal
  Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr
  Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso
  Build the book set list...
  Variable $SGML_CATALOG_FILES not set
  Build the book set list...
  Variable $SGML_CATALOG_FILES not set
  *** File auto-multiple-choice.en.xml
    I lang=en
    * extracting modeles/en/simple-txt
      embedded description / N=AMC-TXT format simple example
    * extracting modeles/en/simple-txt-nominative-sheets
    * extracting modeles/en/simple
      embedded description / N=Simple example
    * extracting modeles/en/groups
      embedded description / N=Groups
    * extracting modeles/en/separate
      embedded description / N=Separate answers
    * extracting modeles/en/scoring
      embedded description / N=Scoring strategy
  Build the book set list...
  Variable $SGML_CATALOG_FILES not set
  In file included from AMC-buildpdf.cc:23:
  buildpdf.cc:42:10: fatal error: opencv2/core/core.hpp: No such file
or directory
     42 | #include "opencv2/core/core.hpp"
        |          ^~~~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  make[2]: *** [Makefile:137: AMC-buildpdf] Error 1

Please close this bug if it turns out to be a collision with another ongoing
transition rather than an OpenCV 5 problem.

Thanks,
Aron
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