nix build fails

[jjacke13]

Greetings!
I am in nixos-25.05 and when i try to build core lightning using the provided flake:
nix build github:ElementsProject/lightning/release-v25.02.2#packages.x86_64-linux.cln-postgres

i get:
`...

GEN plugins/sql-schema_gen.h
> cd external/libwally-core && ./tools/autogen.sh
> /nix/store/516kai7nl5dxr792c0nzq0jp8m4zvxpi-bash-5.2p32/bin/bash: line 1: ./tools/autogen.sh: No such file or directory
> make: *** [external/Makefile:90: external/build-x86_64-unknown-linux-gnu/libwally-core-build/src/secp256k1/libsecp256k1.la] Error 127
> make: *** Waiting for unfinished jobs....`

is that autogen.sh file in the repo ?

[JosephGoulden]

No its not, you need to pull the submodules first. See the developers guide for instructions on using the flake.