From c697be8c28e9325ebfec05558bbc2f18520c8e59 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Fri, 8 Mar 2024 22:36:42 +0000
Subject: [PATCH] temporary fix for cmake cross-compilation

---
 overlay.nix | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/overlay.nix b/overlay.nix
index c6fff9c..d90f6ea 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -77,6 +77,22 @@ extraPkgs // {
 
     };
 
+  # luarocks wants a cross-compiled cmake (which seems like a bug,
+  # we're never going to run luarocks on the device, but ...)
+  # but https://github.com/NixOS/nixpkgs/issues/284734
+  # so we do surgery on the cmake derivation until that's fixed
+
+  cmake = prev.cmake.overrideAttrs(o:
+    # don't override the build cmake or we'll have to rebuild
+    # half the known universe to no useful benefit
+    if final.stdenv.buildPlatform != final.stdenv.hostPlatform
+    then {
+      preConfigure =
+        builtins.replaceStrings
+          ["$configureFlags"] ["$configureFlags $cmakeFlags"] o.preConfigure;
+    }
+    else {}
+  );
 
   dnsmasq =
     let d =  prev.dnsmasq.overrideAttrs(o: {