List of best mirrors for IP address 52.15.49.90, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/multiarch/pool/main/f/fltk1.3/libfltk-gl1.3-dbgsym_1.3.8-5+b1_arm64.deb