fex: skip checkPhase on non-4K pagesize systems

pkgs/by-name/fe/fex/package.nix

@@ -192,7 +192,6 @@ llvmPackages.stdenv.mkDerivation (finalAttrs: {
   cmakeFlags = [
     (lib.cmakeFeature "USE_LINKER" "lld")
     (lib.cmakeFeature "OVERRIDE_VERSION" finalAttrs.version)
-    (lib.cmakeBool "BUILD_TESTING" finalAttrs.finalPackage.doCheck)
     (lib.cmakeBool "BUILD_THUNKS" true)
     (lib.cmakeBool "BUILD_FEXCONFIG" withQt)
     (lib.cmakeFeature "X86_32_TOOLCHAIN_FILE" "${toolchain32}")
@@ -202,8 +201,21 @@ llvmPackages.stdenv.mkDerivation (finalAttrs: {
 
   strictDeps = true;
 
-  # Unsupported on non-4K page size kernels (e.g. Apple Silicon)
+  # Running the tests isn't supported on non-4K pagesize systems, but the build
+  # itself doesn't require 4K pagesize. So, to avoid breaking the build, enable
+  # checkPhase by default (so that the check inputs are included) and then
+  # manually disable it if we're running on a non-4K pagesize system.
   doCheck = true;
+  preConfigure = ''
+    if [ "$(getconf PAGESIZE)" != "4096" ]; then
+      echo "Disabling checkPhase due to non-4K pagesize environment"
+      unset doCheck
+      cmakeFlagsArray+=("-DBUILD_TESTING:BOOL=FALSE")
+    else
+      echo "Keeping checkPhase as-is"
+      cmakeFlagsArray+=("${lib.cmakeBool "BUILD_TESTING" finalAttrs.doCheck}")
+    fi
+  '';
 
   nativeCheckInputs = [ nasm ];
   checkInputs = [ catch2_3 ];