Bug#951965: cimg: FTBFS: ../CImg.h:413:10: fatal error: cv.h: No such file or directory

[Lucas Nussbaum]

Source: cimg
Version: 2.4.5+dfsg-1
Severity: serious
Justification: FTBFS on amd64
Tags: buster sid
Usertags: ftbfs-20200222 ftbfs-buster

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

Relevant part (hopefully):
> g++ -o CImg_demo CImg_demo.cpp -I.. -Wall -Wextra -Wfatal-errors -Werror=unknown-pragmas -Werror=unused-label -Ofast -mtune=generic -Dcimg_use_vt100 -Dcimg_display=1   -Dcimg_use_xrandr  -Dcimg_use_tiff  -Dcimg_use_openexr -I/usr/include/OpenEXR -Dcimg_use_png  -Dcimg_use_jpeg  -Dcimg_use_zlib  -Dcimg_use_curl -Dcimg_use_opencv -I/usr/include/opencv -I/usr/include/opencv -Dcimg_use_magick -I/usr/include/GraphicsMagick -Dcimg_use_fftw3  -lm -lX11 -lpthread  -lXrandr -ltiff -ltiffxx -lIlmImf -lHalf -lpng -lz -ljpeg -lz -lcurl -lopencv_core -lopencv_highgui -lGraphicsMagick++ -lGraphicsMagick -lfftw3 -lfftw3_threads
> In file included from CImg_demo.cpp:48:
> ../CImg.h:413:10: fatal error: cv.h: No such file or directory
>   413 | #include "cv.h"
>       |          ^~~~~~
> compilation terminated.
> make[3]: *** [Makefile:304: CImg_demo] Error 1

The full build log is available from:
   http://qa-logs.debian.net/2020/02/22/cimg_2.4.5+dfsg-1_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.