diff --git a/pkgs/development/tools/misc/blackfire/php-probe.nix b/pkgs/development/tools/misc/blackfire/php-probe.nix
index acb2240fcf05..6d17cc582cee 100644
--- a/pkgs/development/tools/misc/blackfire/php-probe.nix
+++ b/pkgs/development/tools/misc/blackfire/php-probe.nix
@@ -1,7 +1,6 @@
 { stdenv
 , lib
 , fetchurl
-, dpkg
 , autoPatchelfHook
 , php
 , writeShellScript
@@ -18,57 +17,52 @@ let
   hashes = {
     "x86_64-linux" = {
       system = "amd64";
-      sha256 = {
-        "8.1" = "FEb0NBJpwoYaNdEHEn4TkSQR7VShGpHptaDIRKwrmkQ=";
-        "8.2" = "itB0Zm1Mog18F8vIHn9AZMYMzafLQR0v5zcOgqy1ouI=";
+      hash = {
+        "8.1" = "sha256-FEb0NBJpwoYaNdEHEn4TkSQR7VShGpHptaDIRKwrmkQ=";
+        "8.2" = "sha256-itB0Zm1Mog18F8vIHn9AZMYMzafLQR0v5zcOgqy1ouI=";
       };
     };
     "i686-linux" = {
       system = "i386";
-      sha256 = {
-        "8.1" = "0bX2frll0ne6H6o7HNH4TRV2D+NDe11mVvqwhvSDg9E=";
-        "8.2" = "U6zmbEkRr3+9yVwUgQ1+SBNK0zWD92S2KBOHJ1gMmjM=";
+      hash = {
+        "8.1" = "sha256-0bX2frll0ne6H6o7HNH4TRV2D+NDe11mVvqwhvSDg9E=";
+        "8.2" = "sha256-U6zmbEkRr3+9yVwUgQ1+SBNK0zWD92S2KBOHJ1gMmjM=";
       };
     };
     "aarch64-linux" = {
       system = "arm64";
-      sha256 = {
-        "8.1" = "agLQVI3u7ENcWLDRx7YSEBZobRnwEaKAmFpIU5AXhqo=";
-        "8.2" = "Y2bUYaymoZ/Ct5a7K+5U+zNh9ZKUaq0Oal/v04nzuaU=";
+      hash = {
+        "8.1" = "sha256-agLQVI3u7ENcWLDRx7YSEBZobRnwEaKAmFpIU5AXhqo=";
+        "8.2" = "sha256-Y2bUYaymoZ/Ct5a7K+5U+zNh9ZKUaq0Oal/v04nzuaU=";
       };
     };
     "aarch64-darwin" = {
       system = "arm64";
-      sha256 = {
-        "8.1" = "ovTtwXPut9jCvxVyd5mQzrfJPCy+rQvUi4c74NrBzY4=";
-        "8.2" = "8hybE62l8vSwbqpcrnj/lI2Wjy8R3wuO04zwofLi9EY=";
+      hash = {
+        "8.1" = "sha256-ovTtwXPut9jCvxVyd5mQzrfJPCy+rQvUi4c74NrBzY4=";
+        "8.2" = "sha256-8hybE62l8vSwbqpcrnj/lI2Wjy8R3wuO04zwofLi9EY=";
       };
     };
     "x86_64-darwin" = {
       system = "amd64";
-      sha256 = {
-        "8.1" = "WsHH/XJboHeRhxpYY0WtXEJwOsGNFtfexBShC/J7GaQ=";
-        "8.2" = "w3Vu7CTFebn59i1FYVCYHiOadTIPlPCkQ1QHEfvHWig=";
+      hash = {
+        "8.1" = "sha256-WsHH/XJboHeRhxpYY0WtXEJwOsGNFtfexBShC/J7GaQ=";
+        "8.2" = "sha256-w3Vu7CTFebn59i1FYVCYHiOadTIPlPCkQ1QHEfvHWig=";
       };
     };
   };
 
-  makeSource =
-    {
-      system,
-      phpMajor,
-    }:
-
+  makeSource = { system, phpMajor }:
     let
       isLinux = builtins.match ".+-linux" system != null;
     in
     assert !isLinux -> (phpMajor != null);
     fetchurl {
-      url =
-        "https://packages.blackfire.io/binaries/blackfire-php/${version}/blackfire-php-${if isLinux then "linux" else "darwin"}_${hashes.${system}.system}-php-${builtins.replaceStrings [ "." ] [ "" ] phpMajor}.so";
-      sha256 = hashes.${system}.sha256.${phpMajor};
+      url = "https://packages.blackfire.io/binaries/blackfire-php/${version}/blackfire-php-${if isLinux then "linux" else "darwin"}_${hashes.${system}.system}-php-${builtins.replaceStrings [ "." ] [ "" ] phpMajor}.so";
+      hash = hashes.${system}.hash.${phpMajor};
     };
-self = stdenv.mkDerivation rec {
+in
+stdenv.mkDerivation (finalAttrs: {
   pname = "php-blackfire";
   extensionName = "blackfire";
   inherit version;
@@ -76,7 +70,6 @@ self = stdenv.mkDerivation rec {
   src = makeSource {
     system = stdenv.hostPlatform.system;
     inherit phpMajor;
-    inherit (php);
   };
 
   nativeBuildInputs = lib.optionals stdenv.isLinux [
@@ -90,13 +83,13 @@ self = stdenv.mkDerivation rec {
   installPhase = ''
     runHook preInstall
 
-    install -D ${src} $out/lib/php/extensions/blackfire.so
+    install -D ${finalAttrs.src} $out/lib/php/extensions/blackfire.so
 
     runHook postInstall
   '';
 
   passthru = {
-    updateScript = writeShellScript "update-${pname}" ''
+    updateScript = writeShellScript "update-${finalAttrs.pname}" ''
       set -o errexit
       export PATH="${lib.makeBinPath [ curl jq common-updater-scripts ]}"
       NEW_VERSION=$(curl --silent https://blackfire.io/api/v1/releases | jq .probe.php --raw-output)
@@ -106,7 +99,7 @@ self = stdenv.mkDerivation rec {
           exit 0
       fi
 
-      for source in ${lib.concatStringsSep " " (builtins.attrNames passthru.updateables)}; do
+      for source in ${lib.concatStringsSep " " (builtins.attrNames finalAttrs.passthru.updateables)}; do
         update-source-version "$UPDATE_NIX_ATTR_PATH.updateables.$source" "0" "${lib.fakeSha256}"
         update-source-version "$UPDATE_NIX_ATTR_PATH.updateables.$source" "$NEW_VERSION"
       done
@@ -115,19 +108,16 @@ self = stdenv.mkDerivation rec {
     # All sources for updating by the update script.
     updateables =
       let
-        createName =
-          path:
-
+        createName = path:
           builtins.replaceStrings [ "." ] [ "_" ] (lib.concatStringsSep "_" path);
 
-        createSourceParams =
-          path:
-
+        createSourceParams = path:
           let
             # The path will be either [«system» sha256], or [«system» sha256 «phpMajor» «zts»],
             # Let’s skip the sha256.
             rest = builtins.tail (builtins.tail path);
-          in {
+          in
+          {
             system =
               builtins.head path;
             phpMajor =
@@ -136,19 +126,15 @@ self = stdenv.mkDerivation rec {
               else builtins.head rest;
           };
 
-          createUpdateable =
-            path:
-            _value:
+        createUpdateable = path: _value:
+          lib.nameValuePair
+            (createName path)
+            (finalAttrs.self.overrideAttrs (attrs: {
+              src = makeSource (createSourceParams path);
+            }));
 
-            lib.nameValuePair
-              (createName path)
-              (self.overrideAttrs (attrs: {
-                src = makeSource (createSourceParams path);
-              }));
-
-          hashesOnly =
-            # Filter out all attributes other than hashes.
-            lib.filterAttrsRecursive (name: _value: name != "system") hashes;
+        # Filter out all attributes other than hashes.
+        hashesOnly = lib.filterAttrsRecursive (name: _value: name != "system") hashes;
       in
       builtins.listToAttrs
         # Collect all leaf attributes (containing hashes).
@@ -157,14 +143,12 @@ self = stdenv.mkDerivation rec {
           (lib.mapAttrsRecursive createUpdateable hashesOnly));
   };
 
-  meta = with lib; {
+  meta = {
     description = "Blackfire Profiler PHP module";
     homepage = "https://blackfire.io/";
-    sourceProvenance = with sourceTypes; [ binaryNativeCode ];
-    license = licenses.unfree;
-    maintainers = with maintainers; [ shyim ];
+    license = lib.licenses.unfree;
+    maintainers = with lib.maintainers; [ shyim ];
     platforms = [ "x86_64-linux" "aarch64-linux" "i686-linux" "x86_64-darwin" "aarch64-darwin" ];
+    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
   };
-};
-in
-self
+})