diff --git a/pkgs/by-name/cg/cgal/package.nix b/pkgs/by-name/cg/cgal/package.nix
index 8ccae7b37b7e..e475e253adeb 100644
--- a/pkgs/by-name/cg/cgal/package.nix
+++ b/pkgs/by-name/cg/cgal/package.nix
@@ -6,6 +6,7 @@
   boost,
   gmp,
   mpfr,
+  testers,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -17,19 +18,32 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-8wxb58JaKj6iS8y6q1z2P6/aY8AnnzTX5/izISgh/tY=";
   };
 
+  patches = [ ./cgal_path.patch ];
+
+  nativeBuildInputs = [ cmake ];
+
   # note: optional component libCGAL_ImageIO would need zlib and opengl;
   #   there are also libCGAL_Qt{3,4} omitted ATM
   buildInputs = [
-    boost
     gmp
     mpfr
   ];
-  nativeBuildInputs = [ cmake ];
 
-  patches = [ ./cgal_path.patch ];
+  propagatedBuildInputs = [
+    boost
+  ];
 
   doCheck = false;
 
+  passthru = {
+    tests = {
+      cmake-config = testers.hasCmakeConfigModules {
+        moduleNames = [ "CGAL" ];
+        package = finalAttrs.finalPackage;
+      };
+    };
+  };
+
   meta = {
     description = "Computational Geometry Algorithms Library";
     homepage = "http://cgal.org";
diff --git a/pkgs/by-name/ka/kagen/package.nix b/pkgs/by-name/ka/kagen/package.nix
index 1b830896ca49..57842dfa679a 100644
--- a/pkgs/by-name/ka/kagen/package.nix
+++ b/pkgs/by-name/ka/kagen/package.nix
@@ -2,25 +2,22 @@
   lib,
   stdenv,
   fetchFromGitHub,
-  fetchpatch2,
   cmake,
   pkg-config,
   mpi,
-  cgal_5,
-  boost,
-  gmp,
-  mpfr,
+  cgal,
   sparsehash,
   imagemagick,
   gtest,
   ctestCheckHook,
   mpiCheckPhaseHook,
   withExamples ? false,
+  testers,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "kagen";
-  version = "1.1.0";
+  version = "1.2.0";
 
   src = fetchFromGitHub {
     owner = "KarlsruheGraphGeneration";
@@ -28,44 +25,27 @@ stdenv.mkDerivation (finalAttrs: {
     tag = "v${finalAttrs.version}";
     # use vendor libmorton and xxHash
     fetchSubmodules = true;
-    hash = "sha256-FSlTNOQgwPGOn4mIVIgFejvU0dpyydomHYJOKPz1UjU=";
+    hash = "sha256-2jXHHS9Siu6hXrYPIrZSOWe6D2PgsvrbMw/7Ykpc3wk=";
   };
 
-  patches = [
-    # replace asm by builtin function to ensure compatibility with arm64
-    (fetchpatch2 {
-      url = "https://github.com/KarlsruheGraphGeneration/KaGen/commit/cab9d5dc6cc256972e52675ad9c385524d40ecd9.patch?full_index=1";
-      hash = "sha256-DCsuwUiE98UKZMxlUI9p36/wq486uHHrUphrIVqM+Cc=";
-    })
-  ];
-
-  postPatch = ''
-    substituteInPlace tests/CMakeLists.txt \
-      --replace-fail "FetchContent_MakeAvailable(googletest)" "find_package(GTest REQUIRED)"\
-      --replace-fail "set_property(DIRECTORY" "#set_property(DIRECTORY"
-
-    substituteInPlace kagen/CMakeLists.txt \
-      --replace-fail "OBJECT" ""
-  '';
-
   nativeBuildInputs = [
     cmake
     pkg-config
   ];
 
   buildInputs = [
-    mpi
-    cgal_5
-    sparsehash
     imagemagick
-    # should be propagated by cgal
-    boost
-    gmp
-    mpfr
+  ];
+
+  propagatedBuildInputs = [
+    mpi
+    cgal
+    sparsehash
   ];
 
   cmakeFlags = [
     (lib.cmakeBool "BUILD_SHARED_LIBS" (!stdenv.hostPlatform.isStatic))
+    (lib.cmakeBool "KAGEN_USE_BUNDLED_GTEST" false)
     (lib.cmakeBool "KAGEN_BUILD_EXAMPLES" withExamples)
     (lib.cmakeBool "KAGEN_BUILD_TESTS" finalAttrs.finalPackage.doCheck)
   ];
@@ -80,15 +60,24 @@ stdenv.mkDerivation (finalAttrs: {
     mpiCheckPhaseHook
   ];
 
-  disabledTests = lib.optionals (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) [
-    # flaky tests on aarch64-darwin
+  disabledTests = lib.optionals stdenv.hostPlatform.isDarwin [
+    # flaky tests on darwin
     "test_rgg2d.2cores"
     "test_rgg2d.4cores"
+    "test_edge_weights.2cores"
+    "test_edge_weights.4cores"
+    "test_permutation.2cores"
+    "test_permutation.4cores"
   ];
 
-  postInstall = ''
-    cmake --install . --component tools
-  '';
+  passthru = {
+    tests = {
+      cmake-config = testers.hasCmakeConfigModules {
+        moduleNames = [ "KaGen" ];
+        package = finalAttrs.finalPackage;
+      };
+    };
+  };
 
   meta = {
     description = "Communication-free Massively Distributed Graph Generators";