From 5332e5d3b52e5bd70b14fc5b491ea89dce32c88c Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Wed, 17 Sep 2025 12:32:22 +0200
Subject: [PATCH] vcg: switch to CMake

---
 pkgs/by-name/vc/vcg/package.nix | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/pkgs/by-name/vc/vcg/package.nix b/pkgs/by-name/vc/vcg/package.nix
index bf3f4a7ff8e5..8db97500a18f 100644
--- a/pkgs/by-name/vc/vcg/package.nix
+++ b/pkgs/by-name/vc/vcg/package.nix
@@ -3,6 +3,10 @@
 
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
+
+  # nativeBuildInputs
+  cmake,
 
   # propagatedBuildInputs
   eigen,
@@ -19,13 +23,29 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-OZnqFnHGXC9fS7JCLTiHNCeA//JBAZGLB5SP/rGzaA8=";
   };
 
-  propagatedBuildInputs = [ eigen ];
+  patches = [
+    # CMake: install lib and exports
+    # ref. https://github.com/cnr-isti-vclab/vcglib/pull/248
+    # merged upstream
+    (fetchpatch {
+      name = "cmake-install-lib-and-exports.patch";
+      url = "https://github.com/cnr-isti-vclab/vcglib/commit/4a8dd8d6e54890aee76917d27aabfa7031cbc68d.patch";
+      hash = "sha256-b3qsmLu+4VSs943VS3C4gdG/PDR2mhr9/dDTmkep8zo=";
+    })
+  ];
 
-  installPhase = ''
-    mkdir -p $out/include
-    cp -r vcg wrap $out/include
-    find $out -name \*.h -exec sed -i 's,<eigenlib/,<eigen3/,g' {} \;
-  '';
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  propagatedBuildInputs = [
+    eigen
+  ];
+
+  cmakeFlags = [
+    (lib.cmakeBool "VCG_ALLOW_BUNDLED_EIGEN" false)
+    (lib.cmakeBool "VCG_BUILD_EXAMPLES" false)
+  ];
 
   meta = {
     homepage = "https://vcg.isti.cnr.it/vcglib/install.html";