2 files changed, 6 insertions, 2 deletions
diff --git a/pkgs/applications/misc/electron-cash/default.nix b/pkgs/applications/misc/electron-cash/default.nix
index f28d1bf7e0434..f8914a7bb8f45 100644
--- a/pkgs/applications/misc/electron-cash/default.nix
+++ b/pkgs/applications/misc/electron-cash/default.nix
@@ -12,6 +12,10 @@ python3Packages.buildPythonApplication rec {
     sha256 = "sha256-xOyj5XerOwgfvI0qj7+7oshDvd18h5IeZvcJTis8nWo=";
   };
 
+  build-system = with python3Packages; [
+    cython
+  ];
+
   propagatedBuildInputs = with python3Packages; [
     # requirements
     pyaes
@@ -36,7 +40,6 @@ python3Packages.buildPythonApplication rec {
     cryptography
 
     # requirements-hw
-    cython
     trezor
     keepkey
     btchip-python
diff --git a/pkgs/applications/misc/opencpn/default.nix b/pkgs/applications/misc/opencpn/default.nix
index 89d656798008e..52cf30b1ffba2 100644
--- a/pkgs/applications/misc/opencpn/default.nix
+++ b/pkgs/applications/misc/opencpn/default.nix
@@ -108,12 +108,13 @@ stdenv.mkDerivation (finalAttrs: {
     wxGTK32
   ] ++ lib.optionals stdenv.isLinux [
     alsa-utils
-    elfutils
     libselinux
     libsepol
     util-linux
     xorg.libXdmcp
     xorg.libXtst
+  ] ++ lib.optionals (lib.meta.availableOn stdenv.hostPlatform elfutils) [
+    elfutils
   ] ++ lib.optionals stdenv.isDarwin [
     lame
   ];