diff --git a/hosts/common/programs/assorted.nix b/hosts/common/programs/assorted.nix
index 5f6e3a5e..7cf6eae9 100644
--- a/hosts/common/programs/assorted.nix
+++ b/hosts/common/programs/assorted.nix
@@ -294,6 +294,7 @@ in
       "loupe"  # image viewer
       "mate.engrampa"  # archive manager
       "mepo"  # maps viewer
+      "mesa-demos"  # for eglinfo, glxinfo & other testing tools
       "mpv"
       "networkmanagerapplet"  # for nm-connection-editor: it's better than not having any gui!
       "ntfy-sh"  # notification service
@@ -815,6 +816,8 @@ in
     mercurial.sandbox.net = "clearnet";
     mercurial.sandbox.whitelistPwd = true;
 
+    mesa-demos = {};
+
     # actual monero blockchain (not wallet/etc; safe to delete, just slow to regenerate)
     monero-gui.buildCost = 1;
     # XXX: is it really safe to persist this? it doesn't have info that could de-anonymize if captured?