Hmm - looks like flake naming was coming from MANIFOLD_PAR - try tran…

…slating the settings.

CMakeLists.txt

@@ -28,6 +28,15 @@ set(MANIFOLD_VERSION_MINOR 5)
 set(MANIFOLD_VERSION_PATCH 1)
 set(MANIFOLD_VERSION "${MANIFOLD_VERSION_MAJOR}.${MANIFOLD_VERSION_MINOR}.${MANIFOLD_VERSION_PATCH}")
 
+# Correct MANIFOLD_PAR values to on/off (previous NONE/TBB values should still
+# work this way)
+if (DEFINED MANIFOLD_PAR)
+  if ("${MANIFOLD_PAR}" STREQUAL "" OR "${MANIFOLD_PAR}" STREQUAL "NONE")
+    set(MANIFOLD_PAR OFF CACHE BOOL "Normalized MANIFOLD_PAR setting")
+  else()
+    set(MANIFOLD_PAR ON CACHE BOOL "Normalized MANIFOLD_PAR setting")
+  endif ()
+endif ()
 
 # Primary user facing options
 option(MANIFOLD_CROSS_SECTION "Build CrossSection for 2D support" ON)

flake.nix

@@ -22,7 +22,7 @@
             src = clipper2-src;
           });
           manifold =
-            { parallel-backend ? "off"
+            { parallel-backend ? "none"
             , doCheck ? true
             , build-tools ? [ ]
             , ...
@@ -60,9 +60,9 @@
               '';
             };
           parallelBackends = [
-            { parallel-backend = "off"; }
+            { parallel-backend = "none"; }
             {
-              parallel-backend = "on";
+              parallel-backend = "tbb";
               build-tools = with pkgs; [ tbb pkg-config ];
             }
           ];