Can't build without optional dependencies - CMake noob

[HenriqueCrj]

Hi, I'm using Ubuntu 20.04 LTS on WSL 2. When I try to build my project I get the following error:

TIFF is one of the optional libraries for image manipulation, but it looks like I can't build because of it.
Before this error showed up, I had the same error message with JPEG library, and after installing it, the error disapeared. Should I install all the libraries even when they are optional? What am I doing wrong?

[alandefreitas]

The configuration script looks for TIFF at this point:

matplotplusplus/source/3rd_party/CMakeLists.txt

Line 79 in c088749

find_package(TIFF)

and the corresponding options are only set if TIFF_FOUND is set.

I don't know what's happening there, but note that CMake only looks for TIFF but not /usr/lib/x86_64-linux-gnu/libtiff.so specifically. It seems like your configure script thinks it did find TIFF at /usr/lib/x86_64-linux-gnu/libtiff.so specifically for some reason.

To debug that, you could check if TIFF is being found at this point (if TIFF_FOUND is being defined) and at what point and how the FindTIFF.cmake script is finding it.

[HenriqueCrj]

I couldn't debug and ended up cloning the repository and adding matplotplusplus as subdirectory, it was the easiest way. I'll learn how to install a library and try the find_package later. With Windows this doesn't happen, but I have other kind of problem.
Thank you for answering my question.