diff --git a/Dockerfile b/Dockerfile
index ed9bfd0..1086705 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,4 +11,4 @@ RUN apt-get update && \
         llvm-15 llvm-15-dev liblld-15-dev lld-15 clang-15 libclang-15-dev \
         llvm-16 llvm-16-dev liblld-16-dev lld-16 clang-16 libclang-16-dev \
         llvm-17 llvm-17-dev liblld-17-dev lld-17 clang-17 libclang-17-dev \
-        llvm-18 llvm-18-dev liblld-18-dev lld-18 clang-18 libclang-18-dev
+        llvm-18 llvm-18-dev liblld-18-dev lld-18 clang-18 libclang-18-dev libclang-cpp18-dev
diff --git a/run b/run
index c6d5a80..1e027b4 100755
--- a/run
+++ b/run
@@ -3,7 +3,6 @@
 HERE=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
 
 fullbuild() {
-  rm -fr build
   mkdir build
   pushd build
   CC=clang-$1 CXX=clang++-$1 cmake ..
@@ -14,7 +13,6 @@ fullbuild() {
 # zig2
 halfbuild() {
   sed -i '/^add_custom_target(stage3/,/^)$/d' CMakeLists.txt
-  rm -fr build
   mkdir build
   pushd build
   CC=clang-$1 CXX=clang++-$1 cmake ..
@@ -951,10 +949,78 @@ step41() {
     pushd "../zig-$STEP41_"
     cp ../zig-$STEP40_/stage1/zig1.wasm stage1/zig1.wasm
     halfbuild 17
+    #build/zig2 build update-zig1
     popd
   }
 }
 
+# commit 3179f58c414b5e4845b9bf3acdf276fe8e2b88a0
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2023-12-04T21:35:04+02:00
+#
+#     rename std.zig.CrossTarget to std.Target.Query
+#
+STEP42=3179f58c414b5e4845b9bf3acdf276fe8e2b88a0
+STEP42_=0.11.0-1886-g3179f58c41
+step42() {
+  rm -fr "../zig-$STEP42_"
+  git archive --prefix=zig-$STEP42_/ $STEP42 | tar -C .. -x
+  {
+    pushd "../zig-$STEP42_"
+    ../zig-$STEP41_/build/zig2 build --zig-lib-dir lib update-zig1
+    popd
+  }
+}
+
+
+# commit b92e30ff0bd2b77a486451b21d17666a311407f3
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2023-12-06T01:09:07+02:00
+#
+#     std.Build.ResolvedTarget: rename target field to result
+#
+STEP43=b92e30ff0bd2b77a486451b21d17666a311407f3
+STEP43_=0.11.0-1894-gb92e30ff0b
+step43() {
+  rm -fr "../zig-$STEP43_"
+  git archive --prefix=zig-$STEP43_/ $STEP42 | tar -C .. -x
+  {
+    pushd "../zig-$STEP43_"
+    cp ../zig-$STEP41_/stage1/zig1.wasm stage1/zig1.wasm
+    halfbuild 17
+    build/zig2 build update-zig1
+    popd
+  }
+}
+
+# commit 5e2035da145f2c758be26ee9817473b97274c34d
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2023-12-25T04:50:20+02:00
+#
+#     update zig1.wasm
+#
+#     Updates the way CLI parameters for modules and dependencies are
+#     specified.
+#
+#     Old CLI: --mod a:a,b=c:d --deps a,b=c
+#     New CLI: --dep a --dep b=c --mod a d
+#
+STEP44=5e2035da145f2c758be26ee9817473b97274c34d
+STEP44_=0.11.0-1972-g5e2035da14
+step44() {
+  rm -fr "../zig-$STEP44_"
+  git archive --prefix=zig-$STEP44_/ $STEP44 | tar -C .. -x
+  {
+    pushd "../zig-$STEP44_"
+    cp ../zig-$STEP43_/stage1/zig1.wasm stage1/zig1.wasm
+
+    # ignoring all the fun stuff of zig1's changing command-line arguments.
+    # build the "new" zig2 by using the "old" zig1 and the old Makefile!
+    cp ../zig-$STEP43_/CMakeLists.txt .
+    halfbuild 17
+    popd
+  }
+}
 
 
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
@@ -1005,4 +1071,7 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   if [[ "$step" -le 39 ]]; then step39; fi
   if [[ "$step" -le 40 ]]; then step40; fi
   if [[ "$step" -le 41 ]]; then step41; fi
+  if [[ "$step" -le 42 ]]; then step42; fi
+  if [[ "$step" -le 43 ]]; then step43; fi
+  if [[ "$step" -le 44 ]]; then step44; fi
 fi