likwid: add todo (#2531)

* likwid: add todo

* liwkid: add a note on hwloc dependency

var/spack/repos/builtin/packages/likwid/package.py

@@ -35,8 +35,11 @@ class Likwid(Package):
 
     version('4.1.2', 'a857ce5bd23e31d96e2963fe81cb38f0')
 
+    # NOTE: There is no way to use an externally provided hwloc with Likwid.
+    # The reason is that the internal hwloc is patched to contain extra
+    # functionality and functions are prefixed with "likwid_".
+
     # TODO: how to specify those?
-    # depends_on('hwloc')
     # depends_on('lua')
 
     # TODO: check
@@ -57,5 +60,10 @@ def install(self, spec, prefix):
                     'PREFIX = ' +
                     prefix,
                     'config.mk')
+
+        # TODO:
+        # set INSTALL_CHOWN in config.mk to your user/group.
+        # Defaults are root.
+
         make()
         make('install')