diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index 8de31237d..1edf42589 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -10,7 +10,6 @@ on:
     paths:
       - VERSION
 
-
 jobs:
 
   build_wheels:
diff --git a/automation/script/module.py b/automation/script/module.py
index 36752d301..840b69554 100644
--- a/automation/script/module.py
+++ b/automation/script/module.py
@@ -460,7 +460,11 @@ def _run(self, i):
         # Add permanent env from OS (such as MLC_WINDOWS:"yes" on Windows)
         env_from_os_info = os_info.get('env', {})
         if len(env_from_os_info) > 0:
-            env.update(env_from_os_info)
+            # env.update(env_from_os_info)
+            utils.merge_dicts({'dict1': env,
+                               'dict2': env_from_os_info,
+                               'append_lists': True,
+                               'append_unique': True})
 
         # take some env from the user environment
         keys = [
@@ -833,7 +837,10 @@ def _run(self, i):
         script_item_env = meta.get('env', {})
         # print(f"script meta env= {script_item_env}")
 
-        env.update(script_item_env)
+        utils.merge_dicts({'dict1': env,
+                           'dict2': script_item_env,
+                           'append_lists': True,
+                           'append_unique': True})
         # print(f"env = {env}")
 
         script_item_state = meta.get('state', {})
@@ -1915,8 +1922,7 @@ def _run(self, i):
         # Finalize script
 
         # Force consts in the final new env and state
-        utils.merge_dicts({'dict1': env, 'dict2': const,
-                          'append_lists': True, 'append_unique': True})
+        env.update(const)
         utils.merge_dicts({'dict1': state,
                            'dict2': const_state,
                            'append_lists': True,
@@ -3473,7 +3479,7 @@ def _run_deps(self, deps, clean_env_keys_deps, env, state, const, const_state, a
                     if r['return'] > 0:
                         return r
 
-                    # Update env/state with cost
+                    # Update env/state with const
                     env.update(const)
                     utils.merge_dicts({'dict1': state,
                                        'dict2': const_state,
@@ -5052,10 +5058,7 @@ def prepare_and_run_script_with_postprocessing(i, postprocess="postprocess"):
             'return': 16, 'error': 'script {} not found - please add one'.format(path_to_run_script)}
 
     # Update env and state with const
-    utils.merge_dicts({'dict1': env,
-                       'dict2': const,
-                       'append_lists': True,
-                       'append_unique': True})
+    env.update(const)
     utils.merge_dicts({'dict1': state, 'dict2': const_state,
                       'append_lists': True, 'append_unique': True})
 
@@ -5281,8 +5284,7 @@ def run_detect_version(customize_code, customize_common_input,
             logger.debug(recursion_spaces + '  - Running detect_version ...')
 
         # Update env and state with const
-        utils.merge_dicts({'dict1': env, 'dict2': const,
-                          'append_lists': True, 'append_unique': True})
+        env.update(const)
         utils.merge_dicts({'dict1': state,
                            'dict2': const_state,
                            'append_lists': True,
@@ -5312,8 +5314,7 @@ def run_postprocess(customize_code, customize_common_input, recursion_spaces,
             logger.debug(recursion_spaces + '  - Running postprocess ...')
 
         # Update env and state with const
-        utils.merge_dicts({'dict1': env, 'dict2': const,
-                          'append_lists': True, 'append_unique': True})
+        env.update(const)
         utils.merge_dicts({'dict1': state,
                            'dict2': const_state,
                            'append_lists': True,
@@ -5745,7 +5746,8 @@ def update_state_from_meta(meta, env, state, const, const_state, deps, post_deps
         env.setdefault(key, default_env[key])
 
     update_env = meta.get('env', {})
-    env.update(update_env)
+    utils.merge_dicts({'dict1': env, 'dict2': update_env,
+                      'append_lists': True, 'append_unique': True})
 
     update_meta_if_env = meta.get('update_meta_if_env', [])
     update_meta_if_env_from_state = run_state.get('update_meta_if_env', [])
diff --git a/script/install-llvm-src/customize.py b/script/install-llvm-src/customize.py
index b1f5f303b..ea6b02c54 100644
--- a/script/install-llvm-src/customize.py
+++ b/script/install-llvm-src/customize.py
@@ -41,9 +41,9 @@ def preprocess(i):
 
         llvm_build_type = env['MLC_LLVM_BUILD_TYPE']
 
-        targets_to_buuild = env.get('MLC_LLVM_TARGETS_TO_BUILD', 'X86')
+        targets_to_build = env.get('MLC_LLVM_TARGETS_TO_BUILD', 'X86')
 
-        cmake_cmd = f"""cmake {os.path.join(env["MLC_LLVM_SRC_REPO_PATH"], "llvm")} -GNinja -DCMAKE_BUILD_TYPE={llvm_build_type } -DLLVM_ENABLE_PROJECTS={q}{enable_projects}{q} -DLLVM_ENABLE_RUNTIMES={q}{enable_runtimes}{q} -DCMAKE_INSTALL_PREFIX={q}{install_prefix} -DLLVM_ENABLE_RTTI=ON  -DLLVM_INSTALL_UTILS=ON -DLLVM_TARGETS_TO_BUILD={targets_to_build} {extra_cmake_options}"""
+        cmake_cmd = f"""cmake {os.path.join(env["MLC_LLVM_SRC_REPO_PATH"], "llvm")} -GNinja -DCMAKE_BUILD_TYPE={llvm_build_type } -DLLVM_ENABLE_PROJECTS={q}{enable_projects}{q} -DLLVM_ENABLE_RUNTIMES={q}{enable_runtimes}{q} -DCMAKE_INSTALL_PREFIX={q}{install_prefix}{q} -DLLVM_ENABLE_RTTI=ON  -DLLVM_INSTALL_UTILS=ON -DLLVM_TARGETS_TO_BUILD={targets_to_build} {extra_cmake_options}"""
 
         env['MLC_LLVM_CMAKE_CMD'] = cmake_cmd
 
diff --git a/script/install-llvm-src/meta.yaml b/script/install-llvm-src/meta.yaml
index 1973a78c0..0c8d91c43 100644
--- a/script/install-llvm-src/meta.yaml
+++ b/script/install-llvm-src/meta.yaml
@@ -62,12 +62,14 @@ variations:
   clang:
     default: true
     env:
-      +MLC_LLVM_ENABLE_PROJECTS: clang
+      +MLC_LLVM_ENABLE_PROJECTS:
+        - clang
     group: clang
   lld:
     default: true
     env:
-      +MLC_LLVM_ENABLE_PROJECTS: lld
+      +MLC_LLVM_ENABLE_PROJECTS:
+        - lld
     group: lld
   no-clang:
     group: clang
@@ -207,7 +209,8 @@ variations:
     group: repo
   runtimes.#:
     env:
-      +MLC_LLVM_ENABLE_RUNTIMES: '#'
+      +MLC_LLVM_ENABLE_RUNTIMES: 
+        - '#'
   sha.#:
     env:
       MLC_GIT_CHECKOUT_SHA: '#'