diff --git a/pkgs/development/tools/castxml/default.nix b/pkgs/development/tools/castxml/default.nix
index a233288a28e8..17be341f4499 100644
--- a/pkgs/development/tools/castxml/default.nix
+++ b/pkgs/development/tools/castxml/default.nix
@@ -14,13 +14,13 @@
 
 stdenv.mkDerivation rec {
   pname = "CastXML";
-  version = "0.4.3";
+  version = "0.4.4";
 
   src = fetchFromGitHub {
     owner = pname;
     repo = pname;
     rev = "v${version}";
-    hash = "sha256-MschwCEkZrZmNgr8a1ocdukjXzHbXl2gmkPmygJaA6k=";
+    hash = "sha256-VtkMjZOcF5OAHkezlupXOpNwqUD1oKHdRbtG2FZBRL4=";
   };
 
   nativeBuildInputs = [
@@ -30,23 +30,23 @@ stdenv.mkDerivation rec {
     sphinx
   ];
 
-  cmakeFlags = [
-    "-DCLANG_RESOURCE_DIR=${libclang.dev}/"
-    "-DSPHINX_HTML=${if withHTML then "ON" else "OFF"}"
-    "-DSPHINX_MAN=${if withManual then "ON" else "OFF"}"
-  ];
-
   buildInputs = [
+    libclang
     libffi
     libxml2
     zlib
-    libclang
   ];
 
   propagatedBuildInputs = [
     libclang
   ];
 
+  cmakeFlags = [
+    "-DCLANG_RESOURCE_DIR=${libclang.dev}/"
+    "-DSPHINX_HTML=${if withHTML then "ON" else "OFF"}"
+    "-DSPHINX_MAN=${if withManual then "ON" else "OFF"}"
+  ];
+
   # 97% tests passed, 97 tests failed out of 2881
   # mostly because it checks command line and nix append -isystem and all
   doCheck = false;
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 612619c45a3a..099ddf10bdee 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -244,7 +244,7 @@ with pkgs;
 
   castxml = callPackage ../development/tools/castxml {
     inherit (llvmPackages) libclang llvm;
-    inherit (python3Packages) sphinx;
+    inherit (python3.pkgs) sphinx;
   };
 
   catatonit = callPackage ../applications/virtualization/catatonit { };