don't know how to build these paths:
  /nix/store/hwcsx30p0i6mzp5n0lgkfhwxmldwx3yh-cups-headers-riscv64-linux.drv
warning: ignoring the client-specified setting 'store', because it is a restricted setting and you are not a trusted user
platform: riscv64-linux binfmt=false
unpack: /nix/store/kw2bsyglwxmhcdk0amk92wi3nwzjcc65-cups-2.4.19-source
untested: riscv64-linux: no binfmt on this builder
exports: {"name":"cups-headers","includeDirs":["include"],"libDirs":[],"libs":[],"pkgconfigDirs":[],"aclocalDirs":[],"env":{},"propagate":[]}