diff --git a/environments/numlibs/spack.yaml b/environments/numlibs/spack.yaml
index 179f464..46c11e8 100644
--- a/environments/numlibs/spack.yaml
+++ b/environments/numlibs/spack.yaml
@@ -30,6 +30,10 @@ spack:
       - [$num_lib_types]
       - [$^mpis]
       - [$%compilers]
+    - matrix:
+      - [parmgridgen]
+      - [$cflags_noerror_implicit]
+      - [$%compilers]
     - matrix:
       - [superlu-dist, sundials]
       - [$rocm_variant]