meanwhile, same project/shell.nix on macOS stops at

```
checking sodium.h presence... yes
configure: WARNING: sodium.h: present but cannot be compiled
configure: WARNING: sodium.h:     check for missing prerequisite headers?
configure: WARNING: sodium.h: see the Autoconf documentation
configure: WARNING: sodium.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sodium.h: proceeding with the compiler's result
checking for sodium.h... no
checking for sodium_init in -lsodium... no
configure: error: libsodium is required but not found. Try apt-get install libsodium-dev
```