diff --git a/pkgs/by-name/el/elmerfem/package.nix b/pkgs/by-name/el/elmerfem/package.nix
index 21f21231f5fa..aacf40f49afa 100644
--- a/pkgs/by-name/el/elmerfem/package.nix
+++ b/pkgs/by-name/el/elmerfem/package.nix
@@ -11,9 +11,9 @@
   libGL,
   libGLU,
   opencascade-occt,
-  libsForQt5,
+  qt6Packages,
   tbb,
-  vtkWithQt5,
+  vtkWithQt6,
   llvmPackages,
 }:
 stdenv.mkDerivation rec {
@@ -33,21 +33,20 @@ stdenv.mkDerivation rec {
     cmake
     gfortran
     pkg-config
-    libsForQt5.wrapQtAppsHook
+    qt6Packages.wrapQtAppsHook
   ];
 
   buildInputs = [
     mpi
     blas
     liblapack
-    libsForQt5.qtbase
-    libsForQt5.qtscript
-    libsForQt5.qwt
+    qt6Packages.qtbase
+    qt6Packages.qwt
     libGL
     libGLU
     opencascade-occt
     tbb
-    vtkWithQt5
+    vtkWithQt6
   ]
   ++ lib.optional stdenv.cc.isClang llvmPackages.openmp;
 
@@ -55,22 +54,23 @@ stdenv.mkDerivation rec {
     patchShebangs ./
   '';
 
-  storepath = placeholder "out";
-
   NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
 
   cmakeFlags = [
-    "-DELMER_INSTALL_LIB_DIR=${storepath}/lib"
-    "-DWITH_OpenMP:BOOLEAN=TRUE"
-    "-DWITH_MPI:BOOLEAN=TRUE"
-    "-DWITH_QT5:BOOLEAN=TRUE"
-    "-DWITH_OCC:BOOLEAN=TRUE"
-    "-DWITH_VTK:BOOLEAN=TRUE"
-    "-DWITH_ELMERGUI:BOOLEAN=TRUE"
-    "-DCMAKE_INSTALL_LIBDIR=lib"
-    "-DCMAKE_INSTALL_INCLUDEDIR=include"
-    "-DCMAKE_OpenGL_GL_PREFERENCE=GLVND"
-    "-DUSE_MACOS_PACKAGE_MANAGER=False"
+    (lib.cmakeFeature "ELMER_INSTALL_LIB_DIR" "${placeholder "out"}/lib")
+    (lib.cmakeBool "WITH_OpenMP" true)
+    (lib.cmakeBool "WITH_MPI" true)
+    (lib.cmakeBool "WITH_QT6" true)
+    (lib.cmakeBool "WITH_OCC" true)
+    (lib.cmakeBool "WITH_VTK" true)
+    (lib.cmakeBool "WITH_ELMERGUI" true)
+    (lib.cmakeFeature "CMAKE_INSTALL_LIBDIR" "lib")
+    (lib.cmakeFeature "CMAKE_INSTALL_INCLUDEDIR" "include")
+    (lib.cmakeFeature "CMAKE_OpenGL_GL_PREFERENCE" "GLVND")
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    (lib.cmakeBool "USE_MACOS_PACKAGE_MANAGER" false)
+    (lib.cmakeFeature "QWT_INCLUDE_DIR" "${qt6Packages.qwt}/lib/qwt.framework/Headers")
   ];
 
   meta = with lib; {