diff --git a/pkgs/applications/science/electronics/qucs-s/default.nix b/pkgs/applications/science/electronics/qucs-s/default.nix
index 3fd4273fd49a..1f89610c568b 100644
--- a/pkgs/applications/science/electronics/qucs-s/default.nix
+++ b/pkgs/applications/science/electronics/qucs-s/default.nix
@@ -29,8 +29,29 @@ stdenv.mkDerivation rec {
     hash = "sha256-ll5P8cqJBzoieExElggn5tRbDcmH7L3yvcbtAQ0BBww=";
   };
 
+  postPatch = ''
+    # Workaround a CMake bug (we don't generally do distributable bundles in nixpkgs anyway):
+    #   warning: cannot resolve item '/usr/lib/libSystem.B.dylib'
+    #
+    #   possible problems:
+    #       need more directories?
+    #           need to use InstallRequiredSystemLibraries?
+    #               run in install tree instead of build tree?
+    for filename in \
+      qucs/CMakeLists.txt \
+      qucs-transcalc/CMakeLists.txt \
+      qucs-attenuator/CMakeLists.txt \
+      qucs-s-spar-viewer/CMakeLists.txt \
+      ; do
+      substituteInPlace "$filename" \
+        --replace-fail 'fixup_bundle(' 'message(\"nixpkgs will not fixup_bundle: \" '
+    done
+  '';
+
   nativeBuildInputs = [ flex bison wrapQtAppsHook cmake ];
-  buildInputs = [ qtbase qttools qtcharts qtsvg qtwayland libX11 gperf adms ] ++ kernels;
+  buildInputs = [ qtbase qttools qtcharts qtsvg gperf adms ]
+    ++ lib.optionals stdenv.isLinux [ qtwayland libX11 ]
+    ++ kernels;
 
   cmakeFlags = [
     "-DWITH_QT6=ON"
@@ -56,6 +77,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2Plus;
     mainProgram = "qucs-s";
     maintainers = with maintainers; [ mazurel kashw2 thomaslepoix ];
-    platforms = with platforms; linux;
+    platforms = with platforms; unix;
   };
 }
diff --git a/pkgs/by-name/ad/adms/package.nix b/pkgs/by-name/ad/adms/package.nix
index 9546378e01b2..2602b900e244 100644
--- a/pkgs/by-name/ad/adms/package.nix
+++ b/pkgs/by-name/ad/adms/package.nix
@@ -40,6 +40,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/Qucs/adms";
     license = lib.licenses.gpl3;
     maintainers = with lib.maintainers; [ disassembler ];
-    platforms = with lib.platforms; linux;
+    platforms = with lib.platforms; unix;
   };
 }
diff --git a/pkgs/by-name/qu/qucsator-rf/package.nix b/pkgs/by-name/qu/qucsator-rf/package.nix
index 3667d84b280f..f3ef6f64d18a 100644
--- a/pkgs/by-name/qu/qucsator-rf/package.nix
+++ b/pkgs/by-name/qu/qucsator-rf/package.nix
@@ -22,6 +22,12 @@ stdenv.mkDerivation rec {
     hash = "sha256-IvB4CTvK6x4wwUXMoXIqBku1Hh9em6ITTpwFllYsTEg=";
   };
 
+  # Upstream forces NO_DEFAULT_PATH on APPLE
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace-fail '"/usr/local/opt/bison/bin/"' '"${bison}/bin"'
+  '';
+
   nativeBuildInputs = [
     cmake
     flex
@@ -43,6 +49,6 @@ stdenv.mkDerivation rec {
     license = lib.licenses.gpl2Plus;
     mainProgram = "qucsator_rf";
     maintainers = with lib.maintainers; [ thomaslepoix ];
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.unix;
   };
 }