diff --git a/bin/ocran b/bin/ocran
index e798cad..d345042 100644
--- a/bin/ocran
+++ b/bin/ocran
@@ -640,6 +640,8 @@ EOF
 
     Ocran.msg "Building #{Ocran.output_executable}"
     direction = proc do |builder|
+      require_relative "../lib/ocran/build_helper"
+      builder.extend(BuildHelper)
       # Recompute the src_prefix. Files may have been added implicitly
       # while scanning through features.
       files = source_files.map(&:expand_path)
@@ -761,9 +763,9 @@ EOF
       builder.export("RUBYOPT", Ocran.rubyopt.gsub(%r(-r#{Regexp.escape(RbConfig::TOPDIR)}(/.*/bundler/setup)), ""))
       # Add the load path that are required with the correct path after
       # src_prefix was adjusted.
-      load_path = src_load_path.map { |path| TEMPDIR_ROOT / SRCDIR / path.relative_path_from(src_prefix) }
-      builder.export("RUBYLIB", load_path.uniq.join(";"))
-      builder.export("GEM_PATH", TEMPDIR_ROOT / GEMHOMEDIR)
+      load_path = src_load_path.map { |path| SRCDIR / path.relative_path_from(src_prefix) }.uniq
+      builder.set_env_path("RUBYLIB", *load_path)
+      builder.set_env_path("GEM_PATH", GEMHOMEDIR)
 
       # Add the opcode to launch the script
       installed_ruby_exe = BINDIR / Ocran.ruby_executable
diff --git a/lib/ocran/build_helper.rb b/lib/ocran/build_helper.rb
new file mode 100644
index 0000000..0addb8a
--- /dev/null
+++ b/lib/ocran/build_helper.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Ocran
+  module BuildHelper
+    # Sets an environment variable with a joined path value.
+    # This method processes an array of path strings or Pathname objects, accepts
+    # absolute paths as is, and appends a placeholder to relative paths to convert
+    # them into absolute paths. The converted paths are then joined into a single
+    # string using the system's path separator.
+    #
+    # @param name [String] the name of the environment variable to set.
+    # @param paths [Array<String, Pathname>] an array of path arguments which can
+    #        be either absolute or relative.
+    #
+    # Example:
+    #   set_env_path("RUBYLIB", "lib", "ext", "vendor/lib")
+    #   # This sets RUBYLIB to a string such as "C:/ProjectRoot/lib;C:/ProjectRoot/ext;C:/ProjectRoot/vendor/lib"
+    #   # assuming each path is correctly converted to an absolute path through a placeholder.
+    #
+    def set_env_path(name, *paths)
+      value = paths.map { |path|
+        if File.absolute_path?(path)
+          path
+        else
+          File.join(TEMPDIR_ROOT, path)
+        end
+      }.join(File::PATH_SEPARATOR)
+
+      export(name, value)
+    end
+  end
+end