{ lib , callPackage , boost-build , fetchurl }: let makeBoost = file: lib.fix (self: callPackage file { boost-build = boost-build.override { # useBoost allows us passing in src and version from # the derivation we are building to get a matching b2 version. useBoost = self; }; } ); in { boost175 = makeBoost ./1.75.nix; boost177 = makeBoost ./1.77.nix; boost178 = makeBoost ./1.78.nix; boost179 = makeBoost ./1.79.nix; boost180 = makeBoost ./1.80.nix; boost181 = makeBoost ./1.81.nix; boost182 = makeBoost ./1.82.nix; boost183 = makeBoost ./1.83.nix; boost184 = makeBoost ./1.84.nix; boost185 = makeBoost ./1.85.nix; }