thoughts on reading NIX_LD and NIX_LD_LIBRARY_PATH from configuration file?

[contrun]

I find building fuchsia difficult because fuchsia's build script runs env --ignore-environment. My manually-set environment variableNIX_LD is thus unset. If nix-ld is to read the interpreter from some configuration file, then I can run fuchsia's pre-built binaries. What is your opinion of adding configuration file support?