diff --git a/.gitignore b/.gitignore
index 155304b..a04932b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,5 @@ build
 packages/stage1-sysroot/sysroot/
 packages/stage2-sysroot/sysroot/
 packages/stage3-sysroot/sysroot/
-*.zstd
\ No newline at end of file
+*.zstd
+tests/1/main
\ No newline at end of file
diff --git a/builder b/builder
index 88514df..afea04e 100755
--- a/builder
+++ b/builder
@@ -37,8 +37,8 @@ set -e
 command=$1
 VERSION="0.9.0"
 
-LLVM_VERSION="0e0db0a4d7fd606ee58595f997142f7f2476cbe6"
-LLVM_MAJOR_VERSION="17"
+LLVM_VERSION="da3cd333bea572fb10470f610a27f22bcb84b08c"
+LLVM_MAJOR_VERSION="16"
 CMAKE_VERSION="3.26.0"
 NINJA_VERSION="1.11.1"
 ZLIB_VERSION="1.2.13"
@@ -46,6 +46,7 @@ ZSTD_VERSION="1.5.4"
 KERNEL_VERSION="6.0"
 MUSL_VERSION="1.2.3"
 IWYU_VERSION="14e9b208914a84fcdf49bf9f5d08897a4b3dc4b8"
+BOEHMGC_VERSION="8.2.2"
 
 TARGET=x86_64-pc-linux-musl
 
@@ -58,7 +59,8 @@ export LLVM_VERSION \
        LLVM_MAJOR_VERSION \
        MUSL_VERSION \
        TARGET \
-       IWYU_VERSION
+       IWYU_VERSION \
+       BOEHMGC_VERSION
 
 ME=$(cd "$(dirname "$0")/." >/dev/null 2>&1 ; pwd -P)
 
@@ -212,6 +214,14 @@ function build-toolchain() { ## Build the entire thing
     build-tarball
 }
 
+function test-container() { ## Run an alpine container to test the toolchain in the .tmp dir
+    # Make sure to run the build-stage3 first so the .tmp/2/stage3-sysroot/ exist
+    docker run --rm -it -v "$ME/.tmp/2/stage3-sysroot/":/sysroot \
+           -v "$ME/tests/":/tests \
+           alpine:latest /bin/sh
+}
+
+
 function help() { ## Print out this help message
     echo "Commands:"
     grep -E '^function [a-zA-Z0-9_-]+\(\) \{ ## .*$$' "$0" | \
diff --git a/conf/utils.py b/conf/utils.py
index 422e4ec..01f16c3 100644
--- a/conf/utils.py
+++ b/conf/utils.py
@@ -62,15 +62,20 @@ def copy_tree(src, dst, preserve_symlinks=True, ignore=None):
         if skip_this:
             continue
         if item.is_dir():
-            shutil.copytree(
+            copy_tree(
                 item,
                 dst / item.name,
-                dirs_exist_ok=True,
-                symlinks=preserve_symlinks,
-                copy_function=shutil.copy2,
+                preserve_symlinks,
+                ignore,
             )
         elif item.is_file() or item.is_symlink:
-            shutil.copy2(item, dst / item.name, follow_symlinks=not preserve_symlinks)
+            try:
+                shutil.copy2(
+                    item, dst / item.name, follow_symlinks=not preserve_symlinks
+                )
+            except Exception as e:
+                if not item.is_symlink:
+                    raise e
 
 
 def with_static_flags(cmake_vars={}):
diff --git a/packages/boehmgc/conanfile.py b/packages/boehmgc/conanfile.py
index 47fe7de..8f92a0e 100644
--- a/packages/boehmgc/conanfile.py
+++ b/packages/boehmgc/conanfile.py
@@ -28,7 +28,7 @@ from conf.utils import get_version, with_musl_toolchain, copy_dependency_tree
 class BoehmGC(ConanFile):
     name = "boehmgc"
     settings = "os", "arch", "build_type", "compiler"
-    version = "8.2.2"
+    version = get_version("boehmgc")
     options = {
         "stage": [1, 2],
     }
diff --git a/packages/stage3-bundle/conanfile.py b/packages/stage3-bundle/conanfile.py
index 7ac6ad3..58987da 100644
--- a/packages/stage3-bundle/conanfile.py
+++ b/packages/stage3-bundle/conanfile.py
@@ -21,7 +21,7 @@ from conan import ConanFile
 from conan.tools.files import get
 from conan.tools.cmake import CMakeToolchain
 
-from conf.utils import get_version, copy_template, copy_tree, copy_dependency_tree
+from conf.utils import get_version, copy_template, copy_dependency_tree
 
 
 class Stage3(ConanFile):
@@ -40,11 +40,20 @@ class Stage3(ConanFile):
         self.requires(f"zlib/{get_version('zlib')}@{self.user}/{self.channel}")
         self.requires(f"zstd/{get_version('zstd')}@{self.user}/{self.channel}")
         self.requires(f"musl/{get_version('musl')}@{self.user}/{self.channel}")
+        # self.requires(f"cmake-musl/{get_version('cmake')}@{self.user}/{self.channel}")
+        # self.requires(f"ninja-musl/{get_version('ninja')}@{self.user}/{self.channel}")
+        self.requires(f"boehmgc/{get_version('boehmgc')}@{self.user}/{self.channel}")
 
     def build(self):
         copy_dependency_tree(
             self,
-            ["toolchain", "musl", "zlib", "zstd"],
+            [
+                "toolchain",
+                "musl",
+                "zlib",
+                "zstd",
+                "boehmgc",
+            ],
             self.package_folder,
         )
 
diff --git a/packages/stage3-sysroot/toolchain.cmake b/packages/stage3-sysroot/toolchain.cmake
index 3bf3611..ab24727 100644
--- a/packages/stage3-sysroot/toolchain.cmake
+++ b/packages/stage3-sysroot/toolchain.cmake
@@ -17,7 +17,9 @@ set(CMAKE_SYSTEM_NAME Linux)
 
 set(triple @TRIPLE@)
 
-set(CMAKE_SYSROOT @SYSROOT@)
+# You need to set SERENE_TOOLCHAIN_PATH before pointing to this toolchain
+# file
+set(CMAKE_SYSROOT ${SERENE_TOOLCHAIN_PATH})
 set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
 
 set(CMAKE_C_COMPILER "clang")
diff --git a/packages/zlib/conanfile.py b/packages/zlib/conanfile.py
index c45a172..217c0a8 100644
--- a/packages/zlib/conanfile.py
+++ b/packages/zlib/conanfile.py
@@ -71,6 +71,7 @@ class Zlib(ZlibBase):
                 "BUILD_SHARED_LIBS": False,
                 "CMAKE_POSITION_INDEPENDENT_CODE": "ON",
                 "CMAKE_SYSROOT": sysroot,
+                "CMAKE_FIND_ROOT_PATH": sysroot,
             },
             build_script_folder=f"zlib-{self.version}",
         )
diff --git a/packages/zstd/conanfile.py b/packages/zstd/conanfile.py
index 1b7b3b3..ded1790 100644
--- a/packages/zstd/conanfile.py
+++ b/packages/zstd/conanfile.py
@@ -77,6 +77,7 @@ class Zstd(ZstdBase):
                 "ZSTD_BUILD_SHARED": False,
                 "CMAKE_POSITION_INDEPENDENT_CODE": "ON",
                 "CMAKE_SYSROOT": sysroot,
+                "CMAKE_FIND_ROOT_PATH": sysroot,
             },
             build_script_folder=f"zstd-{self.version}/build/cmake/",
         )