Update packages/hxtorch/package.py

packages/hxtorch/package.py

@@ -62,7 +62,7 @@ class Hxtorch(WafPackage):
             query = self.spec[dep.name]
             try:
                 if dep.name in ['pthreadpool', 'fxdiv']:
-                    print('skipping {} in SPACK_INCLUDE_DIRS/CPATH/C{,_PLUS}_INCLUDE_PATH\n'.format(dep.name))
+                    print('skipping {} in SPACK_INCLUDE_DIRS/CPATH/C{{,_PLUS}}_INCLUDE_PATH\n'.format(dep.name))
                     for d in query.headers.directories:
                         if os.path.exists(d):
                             env.remove_path('SPACK_INCLUDE_DIRS', d)