NS3 3.43 not finding packages

[Noel Huibers]

I wanted SQLite support and Eigen3 support of NS-3 and tried to use
./ns3 configure

This outputs me:
SQLite support                : OFF (Missing headers: "sqlite3.h" and missing libraries: "sqlite3")
Eigen3 support                : OFF (Eigen was not found)


Are there possiblities to check why it says its not found?
I can do sqlite3 --version for example and get my current version:
3.46.1 2024-08-13 09:16:08 c9c2ab54ba1f5f46360f1b4f35d849cd3f080e6fc2b6c60e91b16c63f69a1e33 (64-bit)

I use NixOS and have the following packages:

packages = with pkgs; [

firefox

neovim

git

python3

# Building NS-3

binutils

libclang

cmake

gnumake

glibc

gcc

libcxx

# Enabling Support

sqlite

eigen

# Doxygen

doxygen

];

[Gabriel Ferreira]

Well, these libraries are searched in their default directories. Where are the sqlite3.h and eigen.h headers located in NixOS?

[Tommaso Pecorella]

I don't know much about NixOS, but it looks a similar issue to the one described here: https://discourse.nixos.org/t/error-with-cargo-rust-cannot-find-lsqlite3-no-such-file-or-directory/30498

In other terms, you need the "development" package, or to export the headers and library, not just the "sqlite3" binary.

[Noel Huibers]

For other NixOS enthusiasts:

Using a nix flake setup you need to setup your devshell.

Minimal example to recreate:

{

inputs = {

nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

}

outputs =

{

self,

nixpkgs,

...

}@inputs:

let

system = "x86_64-linux";

pkgs = import nixpkgs {

inherit system;

config = {

allowUnfree = true;

};

};

devShell = pkgs.mkShell {

name = "dev-environment";

packages = with pkgs; [

cmake

sqlite

eigen

];

};

in

{

devShells.${system}.default = devShell;

}

}

When configuring your Nixshell you need to add CMake as a dependency, otherwise your shell will use your CMake installation of the system.
This can lead to the problem of CMake not finding your packages, since its stored in a different nix store, then your Headers (of SQLite or Eigen or other additional Packages for NS3).

I'm also trying to find a way to make cppyy work on NixOS. If someone has some good Links for this let me know.

[Tom Henderson]

Thanks for posting; it would be nice to include here in the Linux
chapter (as a separate NixOS section) or else in a separate chapter.

https://www.nsnam.org/docs/installation/html/linux.html

- Tom

> https://discourse.nixos.org/t/error-with-cargo-rust-cannot-find-lsqlite3-no-such-file-or-directory/30498 <https://discourse.nixos.org/t/error-with-cargo-rust-cannot-find-lsqlite3-no-such-file-or-directory/30498>

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[Noel Huibers]

Hey,

a quick update. With help of some other developers we got a cppyy nix package running for NixOS.

Importing:

inputs = {

cppyy = {

url = "github:m-bdf/cppyy-nix";

inputs.nixpkgs.follows = "nixpkgs";

};

}

To use the package:

cppyy.packages.${system}.cppyy

After including it my Python bindings are on, however they don't seem to work yet.

I saw my build is not making a /lib directory. I get a /lib64 though, should I cp it to /lib?

After cp, when trying to run the example of the docs using ns3 shell or ns3 run i get:

 Failed to find libstdc++.so. Make sure its library directory is in LD_LIBRARY_PATH.
Command 'python3 /home/noel/repos/ns-3-dev/examples/wireless/mixed-wired-wireless.py' returned non-zero exit status 1.

I saw the ns3 shell seems to override the LD_LIBRARY_PATH

cd .; export PATH=$PATH:/home/noel/repos/ns-3-dev/build/lib PYTHONPATH=/home/noel/repos/ns-3-dev/build/bindings/python LD_LIBRARY_PATH=/home/noel/repos/ns-3-dev/build/lib ; bash

It therefore makes sense that in the build/lib it doesn't find libstdc++.so.

I'm wondering if this is a known error, or i have gone somewhere wrong.

[Gabriel Ferreira]

I don't believe that is the cause, because this is just the printer help. What it actually does also include whatever is on environment LD_LIBRARY_PATH and PYTHONPATH, as you can see here
https://gitlab.com/nsnam/ns-3-dev/-/blob/master/ns3?ref_type=heads#L1405