nix: Avoid using cuda version in name unless enableCuda is set

Also match the configureFlags in the python to those used in the
lib. But probably we're going to have to generate everything at
once (one source package, but potentially multiple outputs).

Author: league

flake.nix

@@ -38,7 +38,7 @@
       mkpname = basename:
         { enableDebug ? false, enableCuda ? false, cudatoolkit ? null }:
         basename + lib.optionalString enableCuda "-cuda"
-        + lib.optionalString (cudatoolkit != null)
+        + lib.optionalString (enableCuda && cudatoolkit != null)
         (lib.versions.major cudatoolkit.version
           + lib.versions.minor cudatoolkit.version)
         + lib.optionalString enableDebug "-debug";
@@ -137,7 +137,7 @@
           # generating and tweaking the generated ‘libbifrost’ interface. Then
           # also patch ‘add_library_search_dirs’.
           patchPhase = ''
-            ./configure
+            ./configure ${lib.concatStringsSep " " libbifrost.configureFlags}
             cd python
             make bifrost/libbifrost_generated.py
             sed -i \