FITS/XISF image viewer with multithreaded image loading

To get all dependencies install these packages

    sudo apt install qt6-base-dev libqt6opengl6-dev libraw-dev libexif-dev libcfitsio-dev libgsl-dev wcslib-dev cmake

on OpenSUSE

    sudo zypper install gsl-devel exif-devel libraw-devel wcslib-devel libqt6-qtbase-devel

MacOS X

To compile on MacOS install XCode first. Then install homebrew in x86_64 mode
with "arch -i x86_64". Building on native ARM is not supported.

    homebrew install qt6 libraw cfitsio libexif libgsl wcslib

You may need to set CMAKE_PREFIX_PATH for Qt6 so CMake can find them.

Then to build run standard cmake

    cmake -B build -S .
    cmake --build build
    ./build/tenmon