From bc4584e0bbb061e4cd6be10c890a68097265189e Mon Sep 17 00:00:00 2001
From: Adam Joseph <adam@westernsemico.com>
Date: Fri, 23 Dec 2022 20:18:18 -0800
Subject: [PATCH] lib/meta.nix: make availableOn work when meta.platforms is
 missing

Currently, `lib.meta.availableOn` will fail for packages which omit
`meta.platforms` (e.g. `djbdns`).  This commit avoids that failure.
---
 lib/meta.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/meta.nix b/lib/meta.nix
index 74b94211552b6..76c6c8d23f1b1 100644
--- a/lib/meta.nix
+++ b/lib/meta.nix
@@ -97,7 +97,7 @@ rec {
        2. None of `meta.badPlatforms` pattern matches the given platform.
   */
   availableOn = platform: pkg:
-    lib.any (platformMatch platform) pkg.meta.platforms &&
+    ((!pkg?meta.platforms) || lib.any (platformMatch platform) pkg.meta.platforms) &&
     lib.all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
 
   /* Get the corresponding attribute in lib.licenses