dar: cleanup

pkgs/tools/backup/dar/default.nix

@@ -7,8 +7,6 @@ args @ { lib, stdenv, llvmPackages_12, fetchurl
 , CoreFoundation
 }:
 
-with lib;
-
 let
   # Fails to build with clang-11 on Darwin:
   # error: exception specification of overriding function is more lax than base version
@@ -32,10 +30,10 @@ stdenv.mkDerivation rec {
     curl librsync libthreadar
     gpgme libargon2 libgcrypt openssl
     bzip2 lz4 lzo xz zlib
-  ] ++ optionals stdenv.isLinux [
+  ] ++ lib.optionals stdenv.isLinux [
     attr
     e2fsprogs
-  ] ++ optionals stdenv.isDarwin [
+  ] ++ lib.optionals stdenv.isDarwin [
     CoreFoundation
   ];
 
@@ -47,20 +45,20 @@ stdenv.mkDerivation rec {
     "--enable-threadar"
   ];
 
+  hardeningDisable = [ "format" ];
+
+  enableParallelBuilding = true;
+
   postInstall = ''
     # Disable html help
     rm -r "$out"/share/dar
   '';
 
-  enableParallelBuilding = true;
-
-  hardeningDisable = [ "format" ];
-
-  meta = {
+  meta = with lib; {
     homepage = "http://dar.linux.free.fr";
     description = "Disk ARchiver, allows backing up files into indexed archives";
     maintainers = with maintainers; [ izorkin ];
-    license = licenses.gpl2;
+    license = licenses.gpl2Only;
     platforms = platforms.unix;
   };
 }