pkgs.makeStaticBinaries

The following is the current implementation of this function.

makeStaticBinaries =
    stdenv0:
    stdenv0.override (
      old:
      {
        mkDerivationFromStdenv = withOldMkDerivation old (
          stdenv: mkDerivationSuper: args:
          if stdenv.hostPlatform.isDarwin then
            throw "Cannot build fully static binaries on Darwin/macOS"
          else
            (mkDerivationSuper args).overrideAttrs (
              args:
              (
                if (args.__structuredAttrs or false) || (args ? env.NIX_CFLAGS_LINK) then
                  {
                    env = (args.env or { }) // {
                      NIX_CFLAGS_LINK = toString (args.env.NIX_CFLAGS_LINK or "") + " -static";
                    };
                  }
                else
                  {
                    NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -static";
                  }
              )
              // lib.optionalAttrs (!(args.dontAddStaticConfigureFlags or false)) {
                configureFlags = (args.configureFlags or [ ]) ++ [
                  "--disable-shared" # brrr...
                ];
                cmakeFlags = (args.cmakeFlags or [ ]) ++ [ "-DCMAKE_SKIP_INSTALL_RPATH=On" ];
              }
            )
        );
      }
      // lib.optionalAttrs (stdenv0.hostPlatform.libc == "glibc") {
        extraBuildInputs = (old.extraBuildInputs or [ ]) ++ [
          pkgs.glibc.static
        ];
      }
    );