/usr/bin/ns3++ is in libns3-dev 3.27+dfsg-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #! /bin/sh
# This little script compiles a C++ source file with all NS3 dependencies
# You should use it as g++, providing a -o target to specify the output name
all_libs=`ls /usr/lib/libns3*.so|sed -e 's|/usr/lib/||' -e 's/.so$//'`
g++ -Wl,--no-as-needed `pkg-config --libs --cflags $all_libs` "$@"
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