diff --git a/README.md b/README.md
index 6fb2ecd..81ee952 100644
--- a/README.md
+++ b/README.md
@@ -2,19 +2,31 @@
 
 A portable package manager for Unix-like system.
 
-<br>
+## Caveats
 
-**Note**: This project is being actively developed. It's in beta stage and may not be stable. Some features are subject to change without notice.
+- This software is being actively developed. It's in beta stage and may not be stable. Some features are subject to change without notice.
 
-## two implementations
+- Please do NOT place your own files under `~/.ppkg` directory, as `ppkg` will change files under `~/.ppkg` directory without notice.
 
-This project provides two implementations:
+- Please do NOT run `ppkg` command in parallell to avoid destroying the data.
+
+## Two implementations
+
+This software provides two implementations:
 
 1. implemented in `POSIX Shell`, the source code is on `master` branch.
 2. implemented in `C`, the source code is on `dev` branch.
 
 In theroy, these two implementations should have the same behaver except for have bugs.
 
+## Manually build packages using this software via GitHub Actions
+
+In this way, you will be liberated from the rut of setting up the build environemt.
+
+In this way, all you need to do is just clicking the buttons and waiting for finishing. After finishing, a url refers to a zip archive will be provided to download.
+
+For more details please refer to https://github.com/leleliu008/ppkg-package-manually-build
+
 ## Install POSIX-Shell-based ppkg via curl
 
 ```bash
@@ -33,12 +45,7 @@ chmod a+x ppkg
 
 ## ~/.ppkg
 
-all relevant directories and files are located in `~/.ppkg` directory.
-
-**Caveats**:
-
-- Please do NOT place your own files in `~/.ppkg` directory, as `ppkg` will change files in `~/.ppkg` directory without notice.
-- Please do NOT run `ppkg` command in parallell to avoid destroying the data.
+all relevant directories and files are located under `~/.ppkg` directory.
 
 ## ppkg command usage
 
@@ -103,7 +110,7 @@ all relevant directories and files are located in `~/.ppkg` directory.
     ppkg integrate zsh -v
     ```
 
-    This project provides a zsh-completion script for `ppkg`. when you've typed `ppkg` then type `TAB` key, the rest of the arguments will be automatically complete for you.
+    This software provides a zsh-completion script for `ppkg`. when you've typed `ppkg` then type `TAB` key, the rest of the arguments will be automatically complete for you.
 
     **Note**: to apply this feature, you may need to run the command `autoload -U compinit && compinit` in your terminal (your current running shell must be zsh).
 
diff --git a/ppkg b/ppkg
index df97323..bb9662f 100755
--- a/ppkg
+++ b/ppkg
@@ -4409,19 +4409,17 @@ $DOT_CONTENT
         do
             if perl -M"$item" -le 'print "installed"' > /dev/null 2>&1 ; then
                 note "perl module $item has been already installed."
-            else
-                case $item in
-                    XML::Parser)
-                        # https://metacpan.org/release/TODDR/XML-Parser-2.46/source/Makefile.PL#L8-9
-                        export EXPATLIBPATH="$expat_LIBRARY_DIR"
-                        export EXPATINCPATH="$expat_INCLUDE_DIR"
-                        echo EXPATLIBPATH=$EXPATLIBPATH
-                        echo EXPATINCPATH=$EXPATINCPATH
-                        ;;
-                esac
+                continue
+            fi
 
+            if [ "$item" = 'XML::Parser' ] ; then
+                __install_native_package_to_core_dir expat
+                __install_native_package_to_core_dir perl-XML-Parser
+            else
                 # Would you like to configure as much as possible automatically? [yes]
-                run "printf '%s\n' 'yes' | cpan $item"
+                # https://perldoc.perl.org/cpan#PERL_MM_USE_DEFAULT
+                export PERL_MM_USE_DEFAULT=1
+                run cpan "$item"
             fi
         done