diff --git a/pkgs/development/tools/analysis/radare2/default.nix b/pkgs/development/tools/analysis/radare2/default.nix
index f5ce1bbde76..1622c616860 100644
--- a/pkgs/development/tools/analysis/radare2/default.nix
+++ b/pkgs/development/tools/analysis/radare2/default.nix
@@ -13,23 +13,18 @@
 , file
 , libzip
 , xxHash
-, gtk2 ? null
-, vte ? null
-, gtkdialog ? null
-, python3 ? null
-, ruby ? null
-, lua ? null
+, gtk2
+, vte
+, gtkdialog
+, python3
+, ruby
+, lua
 , useX11 ? false
 , rubyBindings ? false
 , pythonBindings ? false
 , luaBindings ? false
 }:
 
-assert useX11 -> (gtk2 != null && vte != null && gtkdialog != null);
-assert rubyBindings -> ruby != null;
-assert pythonBindings -> python3 != null;
-
-
 let
   inherit (lib) optional;
 
diff --git a/pkgs/development/tools/analysis/rizin/cutter.nix b/pkgs/development/tools/analysis/rizin/cutter.nix
index 14d815f04b1..55795b9830c 100644
--- a/pkgs/development/tools/analysis/rizin/cutter.nix
+++ b/pkgs/development/tools/analysis/rizin/cutter.nix
@@ -35,8 +35,6 @@ mkDerivation rec {
     qtWrapperArgs+=(--prefix PYTHONPATH : "$PYTHONPATH")
   '';
 
-  enableParallelBuilding = true;
-
   meta = with lib; {
     description = "Free and Open Source Reverse Engineering Platform powered by rizin";
     homepage = src.meta.homepage;
diff --git a/pkgs/development/tools/analysis/rizin/default.nix b/pkgs/development/tools/analysis/rizin/default.nix
index bbcc432ea99..fdc8da7b5f8 100644
--- a/pkgs/development/tools/analysis/rizin/default.nix
+++ b/pkgs/development/tools/analysis/rizin/default.nix
@@ -40,8 +40,6 @@ stdenv.mkDerivation rec {
     "-Duse_sys_tree_sitter=true"
   ];
 
-  enableParallelBuilding = true;
-
   nativeBuildInputs = [ pkg-config meson ninja cmake ];
 
   buildInputs = [
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 5989f155500..720d2dcdd9e 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -620,7 +620,7 @@ mapAliases ({
   qt-3 = throw "qt-3 has been removed from nixpkgs, as it's unmaintained and insecure"; # added 2021-02-15
   rfkill = throw "rfkill has been removed, as it's included in util-linux"; # added 2020-08-23
   riak-cs = throw "riak-cs is not maintained anymore"; # added 2020-10-14
-  radare2-cutter = cutter;
+  radare2-cutter = cutter; # added 2021-03-30
   rkt = throw "rkt was archived by upstream"; # added 2020-05-16
   ruby_2_0_0 = throw "ruby_2_0_0 was deprecated on 2018-02-13: use a newer version of ruby";
   ruby_2_1_0 = throw "ruby_2_1_0 was deprecated on 2018-02-13: use a newer version of ruby";