diff --git a/env/merlin/sysconfigs/modules.yaml b/env/merlin/sysconfigs/modules.yaml
index a51232a..97d39af 100644
--- a/env/merlin/sysconfigs/modules.yaml
+++ b/env/merlin/sysconfigs/modules.yaml
@@ -1,11 +1,61 @@
+# -------------------------------------------------------------------------
+# This is the default configuration for Spack's module file generation.
+#
+# Settings here are versioned with Spack and are intended to provide
+# sensible defaults out of the box. Spack maintainers should edit this
+# file to keep it current.
+#
+# Users can override these settings by editing the following files.
+#
+# Per-spack-instance settings (overrides defaults):
+#   $SPACK_ROOT/etc/spack/modules.yaml
+#
+# Per-user settings (overrides default and site settings):
+#   ~/.spack/modules.yaml
+# -------------------------------------------------------------------------
 modules:
+  # Paths to check when creating modules for all module sets
+  prefix_inspections:
+    bin:
+      - PATH
+    man:
+      - MANPATH
+    share/man:
+      - MANPATH
+    share/aclocal:
+      - ACLOCAL_PATH
+    lib/pkgconfig:
+      - PKG_CONFIG_PATH
+    lib64/pkgconfig:
+      - PKG_CONFIG_PATH
+    share/pkgconfig:
+      - PKG_CONFIG_PATH
+    '':
+      - CMAKE_PREFIX_PATH
+
+  # These are configurations for the module set named "default"
   default:
+    # Where to install modules
+    roots:
+     tcl: /afs/psi.ch/sys/spack-rhel7/modules
+    # What type of modules to use
     enable:
       - tcl
     tcl:
       all:
         autoload: direct
       projections:
-        root: /afs/psi.ch/sys/spack-rhel7/lmod
-        all: '{name}/{version}/{compiler.name}/{compiler.version}'
+        all: '{name}/{version}/{compiler.name}/{compiler.version}/module'
         ^mpi: '{name}/{version}/{^mpi.name}/{^mpi.version}/{compiler.name}/{compiler.version}/module'
+      gcc:
+        conflict:
+          - 'intel'
+          - 'nvhpc'
+      intel:
+        conflict:
+          - 'gcc'
+          - 'nvhpc'
+      nvhpc:
+        conflict:
+          - 'gcc'
+          - 'intel'