diff --git a/devel/cmark-gfm.sh b/devel/cmark-gfm.sh
new file mode 100755
index 0000000..39d1e36
--- /dev/null
+++ b/devel/cmark-gfm.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+DIR=$(dirname "$(readlink -f "$0")")
+. "$DIR/../env.sh"
+
+
+# install cmark-gfm: convert markdown to html,man,xml,latex,comman-mark
+case "$PM" in
+    apt)
+        sudo apt install -y cmark-gfm
+        ;;
+    pacman)
+        sudo pacman -S --noconfirm --needed cmark-gfm
+        ;;
+esac
+
+# convert to html with embeded <style>: cmark-gfm input.md --to html --unsafe