/usr/share/nrn/examples/nrniv/netcon/ is in neuron 7.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/nrn/examples/nrniv/netcon/ampa.hoc
/usr/share/nrn/examples/nrniv/netcon/ampa.mod
/usr/share/nrn/examples/nrniv/netcon/ampa.ses
/usr/share/nrn/examples/nrniv/netcon/expsyn.hoc
/usr/share/nrn/examples/nrniv/netcon/expsyn.ses
/usr/share/nrn/examples/nrniv/netcon/gsyn.hoc
/usr/share/nrn/examples/nrniv/netcon/gsyn.mod
/usr/share/nrn/examples/nrniv/netcon/gsyn.ses
/usr/share/nrn/examples/nrniv/netcon/k2syn.hoc
/usr/share/nrn/examples/nrniv/netcon/k2syn.mod
/usr/share/nrn/examples/nrniv/netcon/k2syn.ses
/usr/share/nrn/examples/nrniv/netcon/line.hoc
/usr/share/nrn/examples/nrniv/netcon/line.ses
/usr/share/nrn/examples/nrniv/netcon/netcon.inc
/usr/share/nrn/examples/nrniv/netcon/pregen.mod
/usr/share/nrn/examples/nrniv/netcon/sns.hoc
/usr/share/nrn/examples/nrniv/netcon/sns.ses
/usr/share/nrn/examples/nrniv/netcon/test.hoc
/usr/share/nrn/examples/nrniv/netcon/vecevent.hoc
/usr/share/nrn/examples/nrniv/netcon/vecevent.mod
/usr/share/nrn/examples/nrniv/netcon/vecevent.ses