I’m trying to build a C library on a build of NixOS running on WSL2. It requires the expat.h header.
In the NixOS build, I have included expat in environment.systemPackages, but gcc still cannot find the header.
Essentially, I wonder if GCC in NixOS has something similar to withPackages.
I have read the C - NixOS Wiki 45 but still cannot figure it out.
I figured out a way, not sure if the best:
![](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="45" height="45"><rect fill-opacity="0"/></svg>){kind=small}
environment.extraOutputsToInstall = [ "dev" ] - This makes include and I guess .o, .so files available for all packages listed in environment.systemPackages. See [1]environment.variables.C_INCLUDE_PATH = "${nixpkgs.expat.dev}/include" - This makes them available for GCCI usually use nix-locate to find the package/output in which the header lives. Including it in buildInputs is usually enough for the compiler to find it.
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