diff --git a/.ldoc/build_versioned_docs.sh b/.ldoc/build_versioned_docs.sh
new file mode 100755
index 0000000..728103f
--- /dev/null
+++ b/.ldoc/build_versioned_docs.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+
+# place this file in mod ".ldoc" directory
+
+
+d_config="$(dirname $(readlink -f $0))"
+
+cd "${d_config}/.."
+
+d_root="$(pwd)"
+d_export="${d_export:-${d_root}/docs/reference}"
+
+cmd_ldoc="${d_root}/../ldoc/ldoc.lua"
+if test -f "${cmd_ldoc}"; then
+	if test ! -x "${cmd_ldoc}"; then
+		chmod +x "${cmd_ldoc}"
+	fi
+else
+	cmd_ldoc="ldoc"
+fi
+
+# clean old files
+rm -rf "${d_export}"
+
+# store current branch
+main_branch="$(git branch --show-current)"
+
+html_out="<html>\n<head></head>\n\n<body>\n\n<ul>\n"
+
+# generate new doc files
+mkdir -p "${d_export}"
+for vinfo in $(git tag -l --sort=-v:refname | grep "^v[0-9]"); do
+	echo -e "\nbuilding ${vinfo} docs ..."
+	git checkout ${vinfo}
+	d_temp="${d_config}/temp"
+	mkdir -p "${d_temp}"
+
+	# backward compat
+	f_config="${d_root}/docs/config.ld"
+	if test ! -f "${f_config}"; then
+		f_config="${d_config}/config.ld"
+	fi
+
+	if test ! -f "${f_config}"; then
+		echo -e "\nLDoc config not available for ${vinfo}, skipping build ..."
+		continue
+	fi
+
+	"${cmd_ldoc}" --UNSAFE_NO_SANDBOX --multimodule -c "${f_config}" -d "${d_temp}" "${d_root}"; retval=$?
+	if test ${retval} -ne 0; then
+		echo -e "\nERROR: doc build for ${vinfo} failed!"
+		rm -rf "${d_temp}"
+		continue
+	fi
+
+	# show version info
+	for html in $(find "${d_temp}" -type f -name "*.html"); do
+		sed -i -e "s|^<h1>[cC]leaner</h1>$|<h1>Cleaner <span style=\"font-size:12pt;\">(${vinfo})</span></h1>|" \
+			"${html}"
+	done
+
+	if test -d "${d_root}/textures"; then
+		# copy textures to data directory
+		echo -e "\ncopying textures ..."
+		d_data="${d_temp}/data"
+		mkdir -p "${d_data}"
+		texture_count=0
+		for png in $(find "${d_root}/textures" -maxdepth 1 -type f -name "*.png"); do
+			t_png="${d_data}/$(basename ${png})"
+			if test -f "${t_png}"; then
+				echo "WARNING: not overwriting existing file: ${t_png}"
+			else
+				cp "${png}" "${d_data}"
+				texture_count=$((texture_count + 1))
+				printf "\rcopied ${texture_count} textures"
+			fi
+		done
+	fi
+
+	mv "${d_temp}" "${d_export}/${vinfo}"
+	if test -z ${vcur+x}; then
+		vcur="${vinfo}"
+		ln -s "${d_export}/${vinfo}" "${d_export}/current"
+		ln -s "${d_export}/${vinfo}" "${d_export}/latest"
+		html_out="${html_out}  <li><a href=\"current/\">current</a></li>\n"
+		html_out="${html_out}  <li><a href=\"latest/\">latest</a></li>\n"
+	fi
+	html_out="${html_out}  <li><a href=\"${vinfo}/\">${vinfo}</a></li>\n"
+done
+
+html_out="${html_out}</ul>\n\n</body></html>"
+
+cd "${d_root}"
+git checkout ${main_branch}
+
+echo -e "${html_out}" > "${d_export}/index.html"
+
+echo -e "\nDone!"
