okay, litte update… I guess that we are really close 
patching sources
applying patch /nix/store/hnkxp053djcywdq2c5h20v34pg1ygc0f-s.patch
patching file setup.py
autoreconfPhase
autoreconf: export WARNINGS=
autoreconf: error: 'configure.ac' is required
error: builder for '/nix/store/8gq727i8c8chrvb66gvndbmsf9cn50hp-python3.9-nfstream-6.3.5.drv' failed with exit code 1;
last 10 log lines:
> unpacking sources
> unpacking source archive /nix/store/pm457am0szzch8c8glmcdd59bzq7bb4n-source
> source root is source
> setting SOURCE_DATE_EPOCH to timestamp 315619200 of file source/tests/zoom.pcap
> patching sources
> applying patch /nix/store/hnkxp053djcywdq2c5h20v34pg1ygc0f-s.patch
> patching file setup.py
> autoreconfPhase
> autoreconf: export WARNINGS=
> autoreconf: error: 'configure.ac' is required
For full logs, run 'nix log /nix/store/8gq727i8c8chrvb66gvndbmsf9cn50hp-python3.9-nfstream-6.3.5.drv'.
Maybe i can get it right without using autoreconfHook, but using autoconf and specify a configurePhase?