diff --git a/stacks/tutorial/spack.yaml b/stacks/tutorial/spack.yaml
index f11b664521b..a495734dc73 100644
--- a/stacks/tutorial/spack.yaml
+++ b/stacks/tutorial/spack.yaml
@@ -20,9 +20,12 @@ spack:
     specs:
     - zlib-ng@2.2.4
     - zlib-ng@2.0.7
-    - zlib-ng@2.0.7 cflags=-O3
+    - zlib-ng +ipo
+    - zlib-ng build_type=Debug
+    - zlib-ng %clang
     - tcl ^zlib-ng@2.2.4
-    - tcl ^zlib-ng@2.0.7 cflags=-O3
+    - tcl ^zlib-ng@2.0.7 %clang
+    - tcl ^zlib-ng %gcc@14
     - hdf5+mpi^openmpi
     - hdf5~mpi
     - hdf5+hl+mpi ^mpich