opencv: remove CUDA toolkit (#419716)

pkgs/applications/video/obs-studio/plugins/obs-backgroundremoval/default.nix

@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     obs-studio
     onnxruntime
-    opencv
+    opencv.cxxdev
     qt6.qtbase
     curl
   ];

pkgs/by-name/ba/bambu-studio/package.nix

@@ -106,7 +106,7 @@ stdenv.mkDerivation rec {
       webkitgtk_4_0
       wxGTK'
       xorg.libX11
-      opencv
+      opencv.cxxdev
     ]
     ++ lib.optionals withSystemd [ systemd ]
     ++ checkInputs;

pkgs/by-name/ba/basalt-monado/package.nix

@@ -57,7 +57,7 @@ stdenv.mkDerivation {
     libGL
     lz4
     magic-enum
-    opencv
+    opencv.cxxdev
     tbb
     xorg.libX11
   ];

pkgs/by-name/or/orca-slicer/package.nix

@@ -116,7 +116,7 @@ stdenv.mkDerivation (finalAttrs: {
       webkitgtk_4_0
       wxGTK'
       xorg.libX11
-      opencv
+      opencv.cxxdev
       libnoise
     ]
     ++ lib.optionals withSystemd [ systemd ]

pkgs/by-name/qi/qimgv/package.nix

@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     exiv2
     mpv
-    opencv4
+    opencv4.cxxdev
     libsForQt5.qtbase
     libsForQt5.qtimageformats
     libsForQt5.qtsvg

pkgs/by-name/rp/rpcs3/package.nix

@@ -129,7 +129,7 @@ stdenv.mkDerivation (finalAttrs: {
       flatbuffers
       llvm_18
       libSM
-      opencv
+      opencv.cxxdev
       cubeb
     ]
     ++ lib.optional faudioSupport faudio

pkgs/development/libraries/opencv/4.x.nix

@@ -585,17 +585,13 @@ effectiveStdenv.mkDerivation {
       mkdir -p "$cxxdev/nix-support"
       echo "''${!outputDev}" >> "$cxxdev/nix-support/propagated-build-inputs"
     ''
-    # hard-wire CUDA_TOOLKIT_ROOT_DIR so FindCUDA sees the toolkit
     # remove the requirement that the exact same version of CUDA is used in packages
-    #   consuming OpenCV's CMakes files
+    # consuming OpenCV's CMakes files
     + optionalString enableCuda ''
-      sed -i '1s;^;set(CUDA_TOOLKIT_ROOT_DIR ${cudaPackages.cudatoolkit})\n;' \
-        "$out/lib/cmake/opencv4/OpenCVConfig.cmake"
-
       substituteInPlace "$out/lib/cmake/opencv4/OpenCVConfig.cmake" \
         --replace-fail \
           'find_host_package(CUDA ''${OpenCV_CUDA_VERSION} EXACT REQUIRED)' \
-          'find_host_package(CUDA REQUIRED)' \
+          'find_host_package(CUDAToolkit REQUIRED)' \
         --replace-fail \
           'message(FATAL_ERROR "OpenCV static library was compiled with CUDA' \
           'message("OpenCV static library was compiled with CUDA'