diff --git a/JOURNAL.md b/JOURNAL.md
index e7e8668..265cc2e 100644
--- a/JOURNAL.md
+++ b/JOURNAL.md
@@ -5140,3 +5140,12 @@ To trace which accesses are done to the PLIC, I can use the mmiotracer, which
 will hopefully record how we configure the PLIC and lead to a reproducer.
 
     CONFIG_MMIOTRACE=y
+
+## 2024-10-07
+
+Let's move on to the SPEC CPU benchmarks. I compiled them again with the current
+nixpkgs, but they are too large. I made a "mini" version with only the "speed"
+and "integer" variants and removing a couple of large benchmarks.
+
+Still, the closure is gigantic, as they are collecting the environment during
+the build phase and that makes the result depend on the build packages.
diff --git a/pkgs/spec-cpu/mini.nix b/pkgs/spec-cpu/mini.nix
index 251a210..8971a14 100644
--- a/pkgs/spec-cpu/mini.nix
+++ b/pkgs/spec-cpu/mini.nix
@@ -26,12 +26,25 @@ stdenv.mkDerivation rec {
   ];
 
   dontConfigure = true;
-  dontBuild = true;
-  installPhase = ''
-    mkdir -p $out/benchspec/CPU
+  buildPhase = ''
+    pwd
+    mkdir -p benchspec/CPU
     for bench in $benchList; do
-      cp -a ${spec-cpu}/benchspec/CPU/$bench $out/benchspec/CPU/
+      cp -r ${spec-cpu}/benchspec/CPU/$bench benchspec/CPU/
     done
+
+    # Make writable
+    chmod -R +w benchspec
+
+    # Remove environment
+    find benchspec -name '*.cmd' | xargs sed -i '/^-E/d'
+    # Remove compare script as it refers to spec-cpu-tools
+    find benchspec -name 'compare.cmd' -delete
+  '';
+  installPhase = ''
+    pwd
+    mkdir -p $out
+    cp -r benchspec/ $out
     mkdir -p $out/bin
     echo -e "#!$SHELL\necho $out" > $out/bin/spec-cpu-mini
     chmod +x $out/bin/spec-cpu-mini