I'm wondering if libcfitsio is in the right place. I have Ubuntu 20.04, and I find libcfitsio.so here:
ls -la /usr/lib/x86_64-linux-gnu |grep cfitsio -rw-r--r-- 1 root root 2419662 Aug 4 2019 libcfitsio.a lrwxrwxrwx 1 root root 15 Aug 4 2019 libcfitsio.so -> libcfitsio.so.8 lrwxrwxrwx 1 root root 20 Aug 4 2019 libcfitsio.so.8 -> libcfitsio.so.8.3.47 -rw-r--r-- 1 root root 1498520 Aug 4 2019 libcfitsio.so.8.3.47
indiserver -v indi_simulator_telescope indi_simulator_ccd 2021-02-21T13:58:54: startup: indiserver -v indi_simulator_telescope indi_simulator_ccd 2021-02-21T13:58:54: Driver indi_simulator_telescope: pid=648745 rfd=3 wfd=6 efd=7 2021-02-21T13:58:54: Driver indi_simulator_ccd: pid=648746 rfd=4 wfd=9 efd=10 2021-02-21T13:58:54: listening to port 7624 on fd 5 ...