FITS/XISF image viewer with multithreaded image loading

To get all dependencies install these packages

    sudo apt install qtbase5-dev libraw-dev libexif-dev libcfitsio-dev libgsl-dev wcslib-dev libopencv-dev cmake

on OpenSUSE

    sudo zypper install opencv-devel gsl-devel exif-devel libraw-devel wcslib-devel libqt5-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 qt5 libraw cfitsio libexif libgsl wcslib opencv

You may need to set CMAKE_PREFIX_PATH for Qt5 and OpenCV so CMake can find them.

Then to build run standard cmake

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