let
fromEnv = var: def:
let val = builtins.getEnv var; in
if val != "" then val else def;
in {
perl = "@perl@";
shell = "@shell@";
coreutils = "@coreutils@";
bzip2 = "@bzip2@";
xz = "@xz@";
tar = "@tar@";
tr = "@tr@";
nixBinDir = fromEnv "NIX_BIN_DIR" "@bindir@";
}