I don't understand why this bug has come back.
The error is here:
checking how to run the C++ preprocessor... g++ -E
checking whether g++ supports C++11 features by default... yes
checking for OPENCV... no
checking for OPENCV... no
checking for OPENCV... no
configure: error: opencv not found. Not using some image processing.
tail -v -n \+0 config.log
==> config.log <==
because opencv 4.1.2 dropped the pkg-config file.
But opencv 4.1.2+dfsg-4 reintroduced the file (#942562) and now I can
compile with pbuilder and opencv 4.1.2 without any issue.
checking dependency style of g++... (cached) none
checking how to run the C++ preprocessor... g++ -E
checking whether g++ supports C++11 features by default... yes
checking for OPENCV... no
checking for OPENCV... no
checking for OPENCV... yes
checking for LIBRAW... yes
checking for LIBTIFF... yes
checking for jpeg_mem_src in -ljpeg... yes
checking for LIBPNG... yes
