diff --git a/pkgs/development/lisp-modules/nix-cl.nix b/pkgs/development/lisp-modules/nix-cl.nix
index 619a6144c5de..eb51c992dcbc 100644
--- a/pkgs/development/lisp-modules/nix-cl.nix
+++ b/pkgs/development/lisp-modules/nix-cl.nix
@@ -177,15 +177,23 @@ let
         asdf = "${asdfFasl}/asdf.${faslExt}";
       };
 
-      preConfigure = ''
+      configurePhase = ''
+        runHook preConfigure
+
         source ${./setup-hook.sh}
         buildAsdfPath
+
+        runHook postConfigure
       '';
 
       buildPhase = optionalString (src != null) ''
+        runHook preBuild
+
         export CL_SOURCE_REGISTRY=$CL_SOURCE_REGISTRY:$src//
         export ASDF_OUTPUT_TRANSLATIONS="$src:$(pwd):${storeDir}:${storeDir}"
         ${pkg}/bin/${program} ${toString flags} < $buildScript
+
+        runHook postBuild
       '';
 
       # Copy compiled files to store
@@ -200,6 +208,8 @@ let
             concatMapStringsSep "\\|" (replaceStrings ["." "+"] ["[.]" "[+]"]) systems;
         in
       ''
+        runHook preInstall
+
         mkdir -pv $out
         cp -r * $out
 
@@ -207,6 +217,8 @@ let
         find $out -name "*.asd" \
         | grep -v "/\(${mkSystemsRegex systems}\)\.asd$" \
         | xargs rm -fv || true
+
+        runHook postInstall
       '';
 
       dontPatchShebangs = true;
diff --git a/pkgs/development/lisp-modules/packages.nix b/pkgs/development/lisp-modules/packages.nix
index 32467f4ac932..ea93ef4a4572 100644
--- a/pkgs/development/lisp-modules/packages.nix
+++ b/pkgs/development/lisp-modules/packages.nix
@@ -28,20 +28,29 @@ let
       build = (build-asdf-system (args' // { version = args'.version + "-build"; }))
         .overrideAttrs(o: {
           buildPhase = with builtins; ''
+            runHook preBuild
+
             mkdir __fasls
             export ASDF_OUTPUT_TRANSLATIONS="$(pwd):$(pwd)/__fasls:${storeDir}:${storeDir}"
             export CL_SOURCE_REGISTRY=$CL_SOURCE_REGISTRY:$(pwd)//
             ${o.pkg}/bin/${o.program} ${toString (o.flags or [])} < ${o.buildScript}
+
+            runHook postBuild
           '';
           installPhase = ''
+            runHook preInstall
+
             mkdir -pv $out
             rm -rf __fasls
             cp -r * $out
+
+            runHook postInstall
           '';
         });
     in build-asdf-system (args' // {
       # Patches are already applied in `build`
       patches = [];
+      postPatch = "";
       src = build;
     });
 
@@ -151,9 +160,15 @@ let
   cephes = build-with-compile-into-pwd {
     inherit (super.cephes) pname version src lispLibs;
     patches = [ ./patches/cephes-make.patch ];
+    postPatch = ''
+      find \( -name '*.dll' -o -name '*.dylib' -o -name '*.so' \) -delete
+    '';
     postConfigure = ''
       substituteAllInPlace cephes.asd
     '';
+    postInstall = ''
+      find $out -name '*.o' -delete
+    '';
   };
 
   clx-truetype = build-asdf-system {
diff --git a/pkgs/development/lisp-modules/patches/cephes-make.patch b/pkgs/development/lisp-modules/patches/cephes-make.patch
index b67b5f70ad3c..10446972a115 100644
--- a/pkgs/development/lisp-modules/patches/cephes-make.patch
+++ b/pkgs/development/lisp-modules/patches/cephes-make.patch
@@ -1,22 +1,21 @@
 --- a/cephes.asd
 +++ b/cephes.asd
-@@ -5,7 +5,7 @@
- (defclass makefile (source-file) ((type :initform "m")))
- (defmethod perform ((o load-op) (c makefile)) t)
- (defmethod perform ((o compile-op) (c makefile))
--  (let* ((lib-dir (system-relative-pathname "cephes" "scipy-cephes"))
-+  (let* ((lib-dir #P"@out@/scipy-cephes")
-          (lib (make-pathname :directory `(:relative ,(namestring lib-dir))
-                              :name "libmd"
-                              :type #+darwin "dylib" #+(and unix (not darwin)) "so" #+(or windows win32) "dll"))
-@@ -14,7 +14,7 @@
- 	(format *error-output* "Library ~S exists, skipping build" lib)
- 	(format *error-output* "Building ~S~%" lib))
-     (unless built
--      (chdir (native-namestring lib-dir))
-+      (chdir "scipy-cephes")
-       (run-program "make" :output t))))
+@@ -16,7 +16,7 @@
+   (defclass makefile (source-file) ((type :initform "m")))
+   (defmethod perform ((o load-op) (c makefile)) t)
+   (defmethod perform ((o compile-op) (c makefile))
+-    (let* ((lib-dir (system-relative-pathname "cephes" "scipy-cephes/"))
++    (let* ((lib-dir #P"@out@/scipy-cephes/")
+            (lib (make-pathname :directory (pathname-directory lib-dir)
+                                :name #+(or (and unix (not darwin)) windows win32) "libmd"
+ 			       #+(and darwin arm64) "libmd-arm64"
+@@ -30,7 +30,7 @@
+ 	  (format *error-output* "Library ~S exists, skipping build" lib)
+ 	  (format *error-output* "Building ~S~%" lib))
+       (unless built
+-	(chdir (native-namestring lib-dir))
++	(chdir "scipy-cephes")
+ 	(run-program "make" :output t)))))
  
  (defsystem "cephes"
 
-Diff finished.  Thu Mar 28 08:13:30 2024