sratoolkit needs libidn.so.11 this version was introduced to nixpkgs at (libidn: 1.33 -> 1.34 by r-ryantm · Pull Request #38290 · NixOS/nixpkgs · GitHub), and was then later overwritten by a newer version. The old code no longer builds. The error
cp: target 'po/zh_CN.po': Not a directory is confusing because the
zh_CN.po is a file, and not a directory, but why would that result in an error?
patching sources configuring fixing libtool script ./build-aux/ltmain.sh no configure script, doing nothing building build flags: SHELL=/nix/store/dd3713mm8wql4r2d5jxx0f58g16nfm4h-bash-5.1-p16/bin/bash for f in po/*.po.in; do \ cp $f `echo $f | sed 's/.in//'`; \ done cp: target 'po/zh_CN.po': Not a directory