diff --git a/pkgs/applications/science/biology/raxml/default.nix b/pkgs/applications/science/biology/raxml/default.nix
index 5c7353af9315..a77505c1b3f8 100644
--- a/pkgs/applications/science/biology/raxml/default.nix
+++ b/pkgs/applications/science/biology/raxml/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
     sha256 = "1jqjzhch0rips0vp04prvb8vmc20c5pdmsqn8knadcf91yy859fh";
   };
 
-  buildInputs = if mpi then [ pkgs.openmpi ] else [];
+  buildInputs = stdenv.lib.optionals mpi [ pkgs.openmpi ];
 
   # TODO darwin, AVX and AVX2 makefile targets
   buildPhase = if mpi then ''
diff --git a/pkgs/development/libraries/ngt/default.nix b/pkgs/development/libraries/ngt/default.nix
index 977bdf9afe37..7d766eb5d879 100644
--- a/pkgs/development/libraries/ngt/default.nix
+++ b/pkgs/development/libraries/ngt/default.nix
@@ -1,8 +1,13 @@
-{ stdenv, fetchFromGitHub, cmake, llvmPackages, enableAVX ? false }:
+{ stdenv
+, fetchFromGitHub
+, cmake
+, llvmPackages
+, enableAVX ? stdenv.hostPlatform.avxSupport
+}:
+
 stdenv.mkDerivation rec {
   pname = "NGT";
   version = "v1.12.3-alpha";
-  nativeBuildInputs = [ cmake ];
 
   src = fetchFromGitHub {
     owner = "yahoojapan";
@@ -11,11 +16,11 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-nu0MJNpaenOB4+evoSVLKmPIuZXVj1Rm9x53+TfhezY=";
   };
 
+  nativeBuildInputs = [ cmake ];
   buildInputs = [ llvmPackages.openmp ];
-  NIX_ENFORCE_NO_NATIVE=! enableAVX;
-  __AVX2__ = if enableAVX then 1 else 0;
 
-  enableParallelBuilding = true;
+  NIX_ENFORCE_NO_NATIVE = ! enableAVX;
+  __AVX2__ = if enableAVX then 1 else 0;
 
   meta = with stdenv.lib; {
     homepage = "https://github.com/yahoojapan/NGT";
diff --git a/pkgs/games/katago/default.nix b/pkgs/games/katago/default.nix
index 0f9e4b8d67a8..a9ac9e8ac598 100644
--- a/pkgs/games/katago/default.nix
+++ b/pkgs/games/katago/default.nix
@@ -14,11 +14,12 @@
 , ocl-icd ? null
 , gperftools ? null
 , eigen ? null
-, enableAVX2 ? false
+, enableAVX2 ? stdenv.hostPlatform.avx2Support
 , enableBigBoards ? false
 , enableCuda ? false
 , enableGPU ? true
-, enableTcmalloc ? true}:
+, enableTcmalloc ? true
+}:
 
 assert !enableGPU -> (
   eigen != null &&
@@ -103,8 +104,6 @@ in env.mkDerivation rec {
       --prefix LD_LIBRARY_PATH : "/run/opengl-driver/lib"
   '';
 
-  enableParallelBuilding = true;
-
   meta = with stdenv.lib; {
     description = "Go engine modeled after AlphaGo Zero";
     homepage    = "https://github.com/lightvector/katago";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2af5d181280c..5f8511b4ce87 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -23453,7 +23453,7 @@ in
 
   nedit = callPackage ../applications/editors/nedit { };
 
-  ngt = callPackage ../development/libraries/ngt { enableAVX = false; };
+  ngt = callPackage ../development/libraries/ngt { };
 
   nheko = libsForQt5.callPackage ../applications/networking/instant-messengers/nheko { };