diff --git a/make.el b/make.el
index 7eb953c..c803472 100644
--- a/make.el
+++ b/make.el
@@ -50,6 +50,15 @@
 (defvar magic_rb/asset-include
   "\\(ttf\\|svg\\|jpg\\|gif\\|png\\|css\\|js\\|el\\|nb\\|ipynb\\|pdf\\|xml\\|woff2\\)")
 
+(defun org-export-add-target-blank-to-http-links (text backend info)
+  "Add target=\"_blank\" to external links."
+  (when (and
+         (org-export-derived-backend-p backend 'html)
+         (string-match "href=\"https?[^\"]+" text)
+         (not (string-match "target=\"" text)))
+    (string-match "<a " text)
+    (replace-match "<a target=\"_blank\" " nil nil text)))
+
 (defun org-publish-sitemap-filtered (exclude)
   "Publish sitemap filtered using EXCLUDE."
   (lambda (title list)