diff --git a/script/app-mlperf-inference/meta.yaml b/script/app-mlperf-inference/meta.yaml
index abf480eff..dcfea1431 100644
--- a/script/app-mlperf-inference/meta.yaml
+++ b/script/app-mlperf-inference/meta.yaml
@@ -1820,6 +1820,8 @@ variations:
       nvidia-inference-server:
         version: r4.1
         tags: _go
+      nvidia-harness:   
+        tags: _v4.0
       intel-harness:
         tags: _v4.1
       nvidia-scratch-space:
@@ -1841,6 +1843,8 @@ variations:
       nvidia-inference-server:
         version: r4.0
         tags: _mlcommons
+      nvidia-harness:   
+        tags: _v4.0
       intel-harness:
         tags: _v4.1
       inference-src:
@@ -1862,6 +1866,8 @@ variations:
       nvidia-inference-server:
         version: r5.0
         tags: _mlcommons
+      nvidia-harness:   
+        tags: _v5.0
       intel-harness:
         tags: _v4.1
       inference-src:
diff --git a/script/detect-sudo/customize.py b/script/detect-sudo/customize.py
index 3e1b65059..104d8b781 100644
--- a/script/detect-sudo/customize.py
+++ b/script/detect-sudo/customize.py
@@ -27,8 +27,8 @@ def preprocess(i):
         env['MLC_SUDO'] = ''  # root user does not need sudo
         env['MLC_SUDO_USER'] = "yes"
     else:
-        if can_execute_sudo_without_password(
-                logger) or prompt_sudo(logger) == 0:
+        if not is_true(env.get('MLC_SKIP_SUDO')) and (can_execute_sudo_without_password(
+                logger) or prompt_sudo(logger) == 0):
             env['MLC_SUDO_USER'] = "yes"
             env['MLC_SUDO'] = 'sudo'
 
diff --git a/script/get-generic-sys-util/meta.yaml b/script/get-generic-sys-util/meta.yaml
index e0e5ed1d3..01ffa7b9f 100644
--- a/script/get-generic-sys-util/meta.yaml
+++ b/script/get-generic-sys-util/meta.yaml
@@ -662,6 +662,9 @@ variations:
   postfix:
     env:
       MLC_SYS_UTIL_NAME: postfix
+      MLC_SYS_UTIL_VERSION_CMD: postconf mail_version
+      MLC_SYS_UTIL_VERSION_RE: mail_version = \b(\d+\.\d+(?:\.\d+)?)\b
+      MLC_TMP_VERSION_DETECT_GROUP_NUMBER: 1
     new_env_keys:
     - MLC_POSTFIX_VERSION
     state:
diff --git a/script/get-llvm/meta.yaml b/script/get-llvm/meta.yaml
index 8193227b7..abcebd854 100644
--- a/script/get-llvm/meta.yaml
+++ b/script/get-llvm/meta.yaml
@@ -27,6 +27,9 @@ prehook_deps:
     - 'yes'
   names: llvm-install
   reuse_version: true
+  inherit_variation_tags: true
+  skip_inherit_variation_groups:
+    - install-src
   tags: install,llvm
 sort: 100
 tags:
@@ -39,13 +42,24 @@ tags:
 uid: 99832a103ed04eb8
 variations:
   from-prebuilt:
+    group: install-src
+    default: true
     ad:
       llvm-install:
         tags: prebuilt
   from-src:
+    group: install-src
     ad:
       llvm-install:
         tags: src,_clang
   path.#:
     env:
       MLC_LLVM_DIR_PATH: '#'
+  release: {}
+  version.#: {}
+  branch.#: {}
+  runtimes.#: {}
+  flang: {}
+  sha.#: {}
+  tag.#: {}
+