diff --git a/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch b/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch
new file mode 100644
index 0000000..ac81257
--- /dev/null
+++ b/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch
@@ -0,0 +1,39 @@
+From fb173ca3a0cd07789dbd7c71a8e9350eef630352 Mon Sep 17 00:00:00 2001
+From: motiejus <foo@bar>
+Date: Wed, 6 Nov 2024 20:42:27 +0000
+Subject: [PATCH] 0.10.0-961-g54160e7f6a: CMakeLists.txt: remove stage3
+
+---
+ CMakeLists.txt | 19 -------------------
+ 1 file changed, 19 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 997bfd51f6..4ea143bce7 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -862,22 +862,3 @@ set(ZIG_BUILD_ARGS
+   "-Dcpu=${ZIG_TARGET_MCPU}"
+   "-Dversion-string=${RESOLVED_ZIG_VERSION}"
+ )
+-
+-add_custom_target(stage3 ALL
+-  COMMAND zig2 build compile ${ZIG_BUILD_ARGS}
+-  DEPENDS zig2
+-  COMMENT STATUS "Building stage3"
+-  WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+-)
+-
+-if(WIN32)
+-  set(ZIG_EXECUTABLE "${CMAKE_BINARY_DIR}/zig2.exe")
+-else()
+-  set(ZIG_EXECUTABLE "${CMAKE_BINARY_DIR}/zig2")
+-endif()
+-
+-install(CODE "set(ZIG_EXECUTABLE \"${ZIG_EXECUTABLE}\")")
+-install(CODE "set(ZIG_BUILD_ARGS \"${ZIG_BUILD_ARGS}\")")
+-install(CODE "set(CMAKE_INSTALL_PREFIX \"${CMAKE_INSTALL_PREFIX}\")")
+-install(CODE "set(CMAKE_SOURCE_DIR \"${CMAKE_SOURCE_DIR}\")")
+-install(SCRIPT "${CMAKE_SOURCE_DIR}/cmake/install.cmake")
+-- 
+2.39.5
+
diff --git a/run b/run
index b2a58e1..fa2537e 100755
--- a/run
+++ b/run
@@ -89,6 +89,22 @@ BUILTIN_TYPE_=0.10.0-851-gaac2d6b56f
 REMOVE_BUILTIN_TYPE=2a5e1426aa9469fadb78e837d0100d689213b034
 REMOVE_BUILTIN_TYPE_=0.10.0-853-g2a5e1426aa
 
+# commit 54160e7f6aecb4628df633ceaef4c6d956429a3d
+# Author: Veikka Tuominen <git@vexu.eu>
+# Date:   2022-12-21T14:33:02+02:00
+# 
+#     Sema: make overflow arithmetic builtins return tuples
+BUILTINS_4TO2=54160e7f6aecb4628df633ceaef4c6d956429a3d
+BUILTINS_4TO2_=0.10.0-961-g54160e7f6a
+
+# commit 622311fb9ac7ee6d93dcb8cda4b608751f7e092a
+# Author: Veikka Tuominen <git@vexu.eu>
+# Date:   2022-12-21T16:40:30+02:00
+# 
+#     update uses of overflow arithmetic builtins
+BUILTINS_4TO2_USES=622311fb9ac7ee6d93dcb8cda4b608751f7e092a
+BUILTINS_4TO2_USES_=0.10.0-962-g622311fb9a
+
 fullbuild() {
   rm -fr build
   mkdir build
@@ -238,17 +254,58 @@ step6() {
   echo "zig1.wasm updated for $TO_"
 }
 
+step7() {
+  local FROM="$REMOVE_BUILTIN_TYPE"
+  local FROM_="$REMOVE_BUILTIN_TYPE_"
+  local TO="$BUILTINS_4TO2"
+  local TO_="$BUILTINS_4TO2_"
+
+  echo "Updating zig1.wasm from $FROM_ -> $TO_ in ../zig-$TO_"
+  rm -fr "../zig-$TO_"
+  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x
+  {
+    pushd "../zig-$TO_"
+    patch -p1 <"$HERE/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch"
+    cp ../zig-$FROM_/stage1/zig1.wasm stage1/zig1.wasm
+    fullbuild
+    build/zig2 build update-zig1
+    popd
+  }
+}
+
+step8() {
+  local FROM="$BUILTINS_4TO2"
+  local FROM_="$BUILTINS_4TO2_"
+  local TO="$BUILTINS_4TO2_USES"
+  local TO_="$BUILTINS_4TO2_USES_"
+
+  echo "Updating zig1.wasm from $FROM_ -> $TO_ in ../zig-$TO_"
+  rm -fr "../zig-$TO_"
+  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x
+  {
+    pushd "../zig-$TO_"
+    cp ../zig-$FROM_/stage1/zig1.wasm stage1/zig1.wasm
+    fullbuild
+    build/stage3/bin/zig build update-zig1
+    popd
+  }
+}
+
+
+
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   set -xeuo pipefail
   step=${1:-step0}
   step=${step#step}
 
   # works:
-  if [[ "$step" -le 00 ]] ; then step0; fi
-  if [[ "$step" -le 10 ]] ; then step1; fi
-  if [[ "$step" -le 20 ]] ; then step2; fi
-  if [[ "$step" -le 30 ]] ; then step3; fi
-  if [[ "$step" -le 40 ]] ; then step4; fi
-  if [[ "$step" -le 50 ]] ; then step5; fi
-  if [[ "$step" -le 60 ]] ; then step6; fi
+  if [[ "$step" -le 0 ]] ; then step0; fi
+  if [[ "$step" -le 1 ]] ; then step1; fi
+  if [[ "$step" -le 2 ]] ; then step2; fi
+  if [[ "$step" -le 3 ]] ; then step3; fi
+  if [[ "$step" -le 4 ]] ; then step4; fi
+  if [[ "$step" -le 5 ]] ; then step5; fi
+  if [[ "$step" -le 6 ]] ; then step6; fi
+  if [[ "$step" -le 7 ]] ; then step7; fi
+  if [[ "$step" -le 8 ]] ; then step8; fi
 fi