Issue with Eigen3
After this commit was introduced, building Kstars on "older" systems (e.g. openSUSE Leap 15.3) fails with the following error:
[ 246s] -- Configuring done
[ 246s] CMake Error at kstars/CMakeLists.txt:1317 (add_executable):
[ 246s] Target "kstars" links to target "Eigen3::Eigen" but the target was not
[ 246s] found. Perhaps a find_package() call is missing for an IMPORTED target, or
[ 246s] an ALIAS target is missing?
[ 246s]
[ 246s]
[ 246s] CMake Error at kstars/CMakeLists.txt:1136 (add_library):
[ 246s] Target "KStarsLib" links to target "Eigen3::Eigen" but the target was not
[ 246s] found. Perhaps a find_package() call is missing for an IMPORTED target, or
[ 246s] an ALIAS target is missing?
Reverting the change fixes the issue though.