diff --git a/var/spack/repos/builtin/packages/netcdf-fortran/package.py b/var/spack/repos/builtin/packages/netcdf-fortran/package.py
index cd6ed11146..1178de8d57 100644
--- a/var/spack/repos/builtin/packages/netcdf-fortran/package.py
+++ b/var/spack/repos/builtin/packages/netcdf-fortran/package.py
@@ -4,6 +4,9 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 from spack import *
+import os
+import glob
+from shutil import copyfile, Error
 
 
 class NetcdfFortran(AutotoolsPackage):
@@ -69,6 +72,14 @@ def flag_handler(self, name, flags):
             if self.spec.satisfies('%gcc@10:'):
                 # https://github.com/Unidata/netcdf-fortran/issues/212
                 flags.append('-fallow-argument-mismatch')
+            elif self.compiler.name == 'cce':
+                # Cray compiler generates module files with uppercase names by
+                # default, which is not handled by the makefiles of
+                # NetCDF-Fortran:
+                # https://github.com/Unidata/netcdf-fortran/pull/221.
+                # The following flag forces the compiler to produce module
+                # files with lowercase names.
+                flags.append('-ef')
         elif name == 'ldflags':
             # We need to specify LDFLAGS to get correct dependency_libs
             # in libnetcdff.la, so packages that use libtool for linking
@@ -129,3 +140,28 @@ def configure_args(self):
     def check(self):
         with working_dir(self.build_directory):
             make('check', parallel=False)
+
+    @run_after('install')
+    def cray_module_filenames(self):
+        # Cray compiler searches for module files with uppercase names by
+        # default and with lowercase names when the '-ef' flag is specified.
+        # To avoid warning messages when compiler user applications in both
+        # cases, we create copies of all '*.mod' files in the prefix/include
+        # with names in upper- and lowercase.
+        if self.spec.compiler.name != 'cce':
+            return
+
+        with working_dir(self.spec.prefix.include):
+            for f in glob.glob('*.mod'):
+                name, ext = os.path.splitext(f)
+                try:
+                    # Create a copy with uppercase name:
+                    copyfile(f, name.upper() + ext)
+                except Error:
+                    # Assume that the exception tells us that the file with
+                    # uppercase name already exists. Try to create a file with
+                    # lowercase name then:
+                    try:
+                        copyfile(f, name.lower() + ext)
+                    except Error:
+                        pass